BUG: Work-around borland make bug that drops a rule completely if it has no dependencies or commands.

ENH: Use target property for INSTALL_RPATH of SimpleInstall so that it is the only one that needs to relink.

ENH: Implemented RPATH specification support.  It is documented by the command SET_TARGET_PROPERTIES.

ENH: Cleaned up generation of symbolic rules.  Removed generation of rebuild_cache and similar rules from internal makefiles.

ENH: remove warning suppressions for borland compiler, projects wanting this should use -w-, the default warning level is used for all other compilers.  Used to be -w- -whid -waus -wpar

ENH: do not allow mingw makefiles to generate if sh.exe is in the path, also do not write CMakeCache.txt if there is a fatal error.

BUG: Avoid adding unused rules to special targets like ALL_BUILD.  Make sure project regeneration rules go only in desired targets.

BUG: Fixed generation of VS8 solution file to not be re-written when loaded by VS and to work with msbuild.