- use allocator class to wrap the stream pointers instead of passing
  them into ISstream, OSstream and using a dynamic cast to delete
  then. This is especially important if we will have a bidirectional
  stream (can't delete twice!).

STYLE:

- file stream constructors with std::string (C++11)

- for rewind, explicit about in|out direction. This is not currently
  important, but avoids surprises with any future bidirectional access.

- combined string streams in StringStream.H header.
  Similar to <sstream> include that has both input and output string
  streams.

Feature external file coupler

See merge request !126

- do not recheck the abort after it has been triggered once.
  This reduces the output clutter and file checks.

- since the cpu/sys information is invariant, it doesn't make much
  sense to emit by default at every time-step.

- With many processors, the number of entries becomes quite large.

  New controlDict InfoSwitches: "writeSlaves", "writeRoots".

- added an explicit print, but only report profiling to the log
  file from master process.

  We don't wish to overwrite any profiling that was conducted during
  the simulation. Besides which, we don't have a proper Time object
  for handling the write nicely either.

- add note in BuildIssues about the I_MPI_CC variable, which is needed
  when building with Intel-MPI and gcc/clang.

  This additional setting is needed since the changes needed to solve
  the issue of building scotch with Intel-MPI and icc (issue #434)
  means that mpiicc is now being used as the wrapper when compiling
  scotch.

- have the FOAM_MPI short name for INTELMPI start with 'impi-' instead
  of just the version number.
  Intel-MPI is often installed as /opt/intel/impi/4.1.3.049, which
  results in 'FOAM_MPI=4.1.3.049' and the mpi flavour is lost.
  Prefix these cases with 'impi-'

- Added for transition purposes only in 1612 but can now be removed.

Feature post release cleaning

See merge request !123

- a holdover from OpenFOAM 1.4 (prior to the #include dictionary directive)

Feature post release cleaning

See merge request !122

- as of v1706
  extractFromSurfaceCoeffs { ... } is an optional subdictionary

- replace duplicate code with global bounds enums and Enum

- if the enum name is not found, then warn and return the default.

- use typedefs and new features/methods
- file-scope template to avoid code duplication.

- make the purpose of various parts clearer

- can now suppress prefixing an underscore to leading digits.

- 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.