- can use 'XX.empty()' instead of 'XX.size() == 0', 'XX.size() < 1' or
  'XX.size() <= 0' or for simpler coding.
  It also has the same number of characters as '!XX.size()' and /might/ be
  more readable

- many size checking had 'XX.size() > 0', 'XX.size() != 0', or 'XX.size() >= 1'
  when a simple 'XX.size()' suffices

- string doesn't use any debug info, remove it
- restructured the macros to add in NoDebug macro versions to className,
  typeInfo.  Might be helpful with tackling the globals bootstrapping issue.
- HashTableName + StaticHashTableName - avoid lookup of debug switch when
  FULLDEBUG is not defined

http://openfoam.cfd-online.com/cgi-bin/forum/show.cgi?126/10427

- avoids problems with finding files based on FOAMversion
  (reported by Mattijs)

- Problem: changing between OpenFOAM versions with different
  WM_PROJECT_INST_DIR paths would leave the old paths in the env vars.

- TODO: etc/cshrc is rougned out, but needs work on the corresponding
  if-statement

- motivation: we could probably reuse the Switch::asBool() within boolIO.C
  ... and possibly make Switch is-a bool and has-a word (or has-a enum for
  the word) for reuse with nicer output values for bool

Conflicts:

	src/OpenFOAM/db/IOstreams/Pstreams/IPstream.C
	src/OpenFOAM/db/IOstreams/Pstreams/OPstream.C

- we can now use a list of words/regexp for filtering/selecting
  ... the first results: cellTable/boundaryRegion

regExp:
- added optional ignoreCase for constructor.
- the compile() methods is now exposed as set(...) method with an optional
  ignoreCase argument.  Not currently much use for the other regex compile
  flags though. The set() method can be used directly instead of the
  operator=() assignment.

keyType + wordRe:
- it's not clear that any particular characters are valid/invalid (compared
  to string or word), so just drop the valid(char) method for now

wordRe:
- a bool doesn't suffice, added enum compOption (compile-option)
- most constructors now have a compOption. In *all* cases it defaults to
  LITERAL - ie, the same behaviour for std::string and Foam::string
- added set(...) methods that do much the same as operator=(...), but the
  compOption can be specified.  In all cases, it defaults to DETECT.

 In Summary
    By default the constructors will generally preserve the argument as
    string literal and the assignment operators will use the wordRe::DETECT
    compOption to scan the string for regular expression meta characters
    and/or invalid word characters and react accordingly.

    The exceptions are when constructing/assigning from another
    Foam::wordRe (preserve the same type) or from a Foam::word (always
    literal).

- The capitalization is consistent with most other template classes, but
  more importantly frees up xfer() for use as method name without needing
  special treatment to avoid ambiguities.

  It seems reasonable to have different names for transfer(...) and xfer()
  methods, since the transfer is occuring in different directions.
  The xfer() method can thus replace the recently introduced zero-parameter
  transfer() methods.
  Other name candidates (eg, yield, release, etc.) were deemed too abstract.