ENH: Added optional configuration of data/doc/man dirs.  This will be useful for package maintainers.

ENH: Added QUIET optional argument to block error message when _DIR variable is not set.  Also removed upper-casing of package name.

BUG: Custom commands should have variables expanded before comparing with previously added custom commands.

ENH: Replace WRITE_FILE with FILE(WRITE and FILE(APPEND. Replace MAKE_DIRECTORY with FILE(MAKE_DIRECTORY, replace STRING(ASCII things

ENH: Added SEE ALSO section to generated man page.  Minor formatting improvements for generated text-only documentation.

ENH: Added CMAKE_STANDARD_INTRODUCTION macro defining standard documentation for inclusion in every binary's documentation.

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

ENH: Added support for # characters inside quoted arguments and for escaping # in a non-quoted argument.  Improved parsing speed by not compiling regular expressions on blank lines.