- adjust comment formatting to reduce clutter

- relocate WM_COMPILER_ARCH, WM_COMPILER_LIB_ARCH from
  etc/{bashrc,cshrc} to etc/config.{csh,sh}/settings since these
  should not be changed by the user anyhow.

- Use gcc/g++ as common base and specialize afterwards (to reduce
  duplication)

- adjust format of WM_PROJECT_SITE fallback to allow for easier
  automated edits

- the (global) associative array requires bash >= 4.2

- the cray C/C++ compilers appear to be option-compatible with gcc.

- no wmake rules for 32bit builds (deemed to be unnecessary)

- use complete -o filenames, dropped -o nospace to make it more responsive.

- restructure completion code to use a unified backend, which makes it easier
  understand, maintain and re-use.

- foamCreateBashCompletions now simply outputs to a stdout, and allows
  quick generation of completion of single applications.

- add -fileHandler completion in anticipation of future changes there.

- relocated as etc/config.s/bash_completion to prevent inadvertently
  having two versions (.com, .org) installed at the same time.

- allows configuration without an environment variable.
  For compatibility still respect FOAM_SIGFPE and FOAM_SETNAN
  env-variables

- The env-variables are now treated as true/false switch values.
  Previously there was just a check for env exists or not, but this
  can be fairly fragile for a user's environment.

- minor cleanup of bash completion script

- suppress error messages that appear with zsh.
  According to unset(1p), 'unset -f' unsets a function.
  If the function was not previously defined, this is a no-op.
  This is similar for zsh, but there it emits a warning if the
  function was not previously defined.

- avoid 'local' in functions sources from etc/bashrc.
  ksh does not support this.

- use 'command' shell builtin instead of 'type'.
  Seems to be more consistent between shell flavours.

- this implies that jobControl is a user-resource for OpenFOAM.
  It was previously located under $WM_PROJECT_INST_DIR/jobControl,
  but few users will have write access there.

- an unset FOAM_JOB_DIR variable is treated as "~/.OpenFOAM/jobControl",
  which can partially reduce environment clutter.

- provide argList::noJobInfo() to conveniently suppress job-info on an
  individual basis for short-running utilities (eg, foamListTimes) to
  avoid unneeded clutter.

- permit SYSTEMMPI user adjustments via
      etc/config.{csh,sh}/mpi-system
  This can be a convenient place for setting up SYSTEMMPI for OpenFOAM
  without adjusting bashrc, prefs.sh ...

- add a USERMPI type. This represents any generic mpi implementation.
  The user is responsible for supplying an appropriate
  wmake/rules/General/mplibUSERMPI file and managing all settings.

  This type of setup can be useful in combination with specific build
  systems (SPACK, EASYBUILD, etc) or module systems for which the MPI
  variant is part of the installed configuration.

- cleanup variables last in etc/bashrc for a clean exit code

- this allows the sys-admin to provide base values independent of any
  WM_PROJECT_SITE value.

Resolves patch request https://bugs.openfoam.org/view.php?id=2490

- handle sourcing bashrc with a relative path (issue #383)
- handle sourcing from bash and zsh.
  Still need manual intervention when sourcing dash, sh, or ksh.
- replace grep in etc/cshrc with sed only
- logical instead of physical path for WM_PROJECT_DIR (issue #431).
  Doesn't seem to be possible for csh/tcsh.

  * Continue using physical locations when comparing directories,
    but not for the top-level FOAM_INST_DIR, WM_PROJECT_DIR.

- relocate WM_CC, WM_CXX overrides from etc/config.*/compiler
  to etc/config.*/settings to ensure that they are left untouched
  when etc/config.sh/compiler is sourced while making third-party
  packages (eg, gcc, llvm, CGAL).

- provide fallback FOAM_TUTORIALS setting in RunFunctions

STYLE: remove "~OpenFOAM" fallback as being too rare, non-obvious

- easier to test or use different versions

- change WM_CXXFLAGS to -std=c++11 instead of -std=c++0x

Can now use this:
    _foamSourceEtc config.sh/scotch
    _foamSourceEtc config.csh/scotch

instead of this:
    _foamSource $($WM_PROJECT_DIR/bin/foamEtcFile config.sh/scotch)
    _foamSource `$WM_PROJECT_DIR/bin/foamEtcFile config.csh/scotch`

In the bash/sh version, leave the _foamSource function for now, since
ThirdParty is still relying on it.

STYLE: elminate while-loop for _foamAddPath etc since this type of
construct isn't readily possible for csh and isn't being used anywhere.

- bump ADIOS version to 1.11.1

- makes it easier to switch between mpi implementations (eg, openmpi, intelmpi etc)

- add comment about compiler setting for KNL

- sometimes used for off-screen rendering.
  Only add to library-path when they are actually available

- the configuration settings can be used for the third-party build,
  but the configuration is not yet actively enabled in
  etc/bashrc, etc/cshrc

Resolves request http://bugs.openfoam.org/view.php?id=2367

- consistently use SYSTEMOPENMPI for both sh and csh versions
  (inadvertently changed in ee5251a7).

Patch contributed by Bruno Santos
Resolves bug-report http://bugs.openfoam.org/view.php?id=2310

Patch contributed by Bruno Santos
Resolves bug-report http://bugs.openfoam.org/view.php?id=2312

- It is incorrect to prefix the assignment with an 'export' since this
  automatically marks the overall command as successful and circumvents
  the fallback.

  There is no simple way to have proper behaviour when sourced with a
  local directory path, but at least it now uses the fallback.

  It is still easy to wreak the mechanism with valid but confusing input.
  For example,

     ". /path/to/openfoam/etc/././bashrc"

  The only real certainty is that "${BASH_SOURCE%/*}"
  should point to the 'etc/' directory. In which case,

      cd ${BASH_SOURCE%/*}    # <- now in the etc/ directory
      pwd=$(pwd -P)           # <- fully-qualified path to etc/
      pwd=${pwd%/*/*}         # <- up two parent levels

  - This works with ". ./bashrc", but fails with ". bashrc"
    (probably not so common).
  - Con: The construct requires an additional sub-shell.

- instead we use the CGAL settings directly since they have the
  same option of (version | system | none)

- may wish to review this again in the future.

Resolves bug-report http://bugs.openfoam.org/view.php?id=2223

  - "$FOAM_USER_APPBIN" and "$FOAM_USER_LIBBIN" have been added to
    "foamOldDirs" in "etc/bashrc" and "etc/config.sh/unset"

  - "$OPAL_PREFIX" is now undefined in the option "SYSTEMOPENMPI" within
    "etc/config.sh/mpi", but only if the path defined in this variable
    is cleaned when using "foamCleanPath".

  - "$OPAL_PREFIX" is now also conditionally undefined in
    "etc/config.sh/unset" when the path is picked up by "foamCleanPath".

Patch contributed by Bruno Santos
Resolved bug-report http://bugs.openfoam.org/view.php?id=2210

- export/setenv WM_COMPILER_TYPE as suggested by Mattijs.

- for overall consistency, don't carp about an unset WM_COMPILER_TYPE,
  since this would only be on the first instance (prior to the
  export/setenv) and would be confusing about why/when this message
  may occur.

- reduce clutter: only use (system|ThirdParty) for WM_COMPILER_TYPE.
  Drop the old 'OpenFOAM' setting for WM_COMPILER_TYPE, which was
  transitional in early 2011.

- make the error messages more meaningful