- minor cleanup of wmake sources

ENH: Function objects - updated logic to determine whether or not to instantiate a time-based function object.  Fixes #439

ENH: Feature noise additions

See merge request !98

Both point- and surfaceNoise utilities can operate on multiple input
files.  However, if the files had the same name, the output would be
overwritten.  To avoid this, the output files are now written to a
sub-directory including the path '/input<input-file-index>/', e.g.

  postProcessing/noise/surfaceNoise/input0/nearWall/[fft|oneThirdOctave]

An optional 'outputPrefix' can be included (defaults to empty), e.g.
when set to 'test1':

  postProcessing/noise/test1/surfaceNoise/input0/nearWall/[fft|oneThirdOctave]

- easier to test or use different versions

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

- adjust so that the final -option is taken. This is consistent with
  other Unix tools.

ENH: short-circuit to avoid directory check on non-master node

- tends to obscure what is going on and isn't needed either.

STYLE: adjust documentation. Accept std::string as parameter in more places.

- the purpose is more explicit, without needing to check documentation
  about what the bool parameter means.

STYLE: improve formatting of fileName documentation

Merge branch 'feature-noise-additions' of develop.openfoam.com:Development/OpenFOAM-plus into feature-noise-additions

- was previously only within string expansions, but cover dictionaries
  as well for consistency

ENH: replace the never-used fileName::caseName() functionality

- stringOps::inplaceReplaceVar() is more general

     stringOps::inplaceReplaceVar(myfile, "FOAM_CASE");

STYLE: relax parameter passing when calling some POSIX 'query' functions.

- A std::string is sufficient since the functions use a plain C-string.
  Eg, getEnv("SOMETHING").
  Retain more stringent Foam::word for things like setEnv, since this
  could be useful.

- the regex was not being unset on assignment.
- drop unused recompile() method as being dubious

- caused by the typo '@E' instead of '$E' (commit a0094dee)

ENH: minor improvements for wmake/src makefile

- 'make clean' now also tries to remove the parent platforms/
  directory if possible.

- the flex intermediate build target is placed into the platforms/
  directory to avoid touching the src/ directory at all.

- suppress warnings about unused functions (GCC only)