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Note that now mirrorMesh does not delete empty patches anymore.

     fixes #560

- assists when building simple hand-rolled parsers.
  Also add string::split() taking a sub-string for the delimiter.

- access tokenType enum values more consistently.

- The logic for switching input-mode was previously completely
  encapsulated within the #inputMode directive, but without any
  programming equivalent. Furthermore, the encapsulation in inputMode
  made the logic less clear in other places.

  Exposing the inputMode as an enum with direct access from entry
  simplifies things a fair bit.

- eliminate one level of else/if nesting in entryIO.C for clearer logic

- for dictionary function entries, simply use
  addNamedToMemberFunctionSelectionTable() and avoid defining a type()
  as a static. For most function entries the information is only used
  to get a name for the selection table lookup anyhow.

- consolidate word::validated() into word::validate() and also allow
  as short form for string::validate<word>(). Also less confusing than
  having similarly named methods that essentially do the same thing.

- more consistent const access when iterating over strings

- add valid(char) for keyType and wordRe

- error::throwExceptions(bool) returning the previous state makes it
  easier to set and restore states.

- throwing() method to query the current handling (if required).

- the normal error::throwExceptions() and error::dontThrowExceptions()
  also return the previous state, to make it easier to restore later.

- this represents a partial revert for commit 6a0a8b99

- the 'protect' inputMode is used to supply defaults.
  If an entry already exists, it should act as a no-op without any
  side-effects whatsoever.

- mostly associated with forgotten quotes around "(abd|def)" ...

- Address different potential problems:

      (key) { key1   entry1; }
      (key) { key1   entry1; };    // <- Note trailing ';'
      (key) entry2;

- clear error flags. Special handling for igzstream.

- resets the output buffer completely - implementing what rewind was
  likely meant to have accomplished for many use cases.

STYLE: OSHA1stream reset() for symmetry. Deprecate rewind().

- 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.

- 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.

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

- generic means of holding ranges of substring iterators

- makes the purpose clearer.
  In some places, string::resize() is even simpler.

- use C++11 string::back() in preference to str[str.size()-1]

- this now appears to be the more common use case.

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

- 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.