ENH: add the unix makefile generator as an option from the windows GUI, this builds with mingw, cygwin, and combinations of make cl, bcc32

ENH: Added use of KWSYS_HEADER macro in c and cxx files to include kwsys headers through their configured namespace.

ENH: Add optional argument to GetLineFromStream which can let the caller know whether there was a new line character at the end of the line that was just read

ENH: Using GetTempPath instead of TEMP environment variable to get a location to write the Win9x forwarding executable.

BUG: Argument parsers do not always remove double quotes from around an argument that has no spaces.

BUG: Install target for standard header wrappers must point at the std subdirectory in the installation.

ERR: Added casts to remove type conversion warnings.  Pointer differences can be 64-bit, but unsigned long is 32-bit on many platforms.  We know we are not traversing more data than can be handled by an unsigned long, though, because the length argument is an unsigned long.

ERR: Reduced requirements on preprocessor for export macro due to limitations of Mac preprocessor.  The preprocessor can be fixed by using -no-cpp-precomp, but we don't want to require that option for every source file that includes our headers.