BUG: Need to remove the MAKEFLAGS when cmake starts.  If cmake is run from inside make, we don't want the try-compiles to inherit the makeflags.

ENH: When the initially configured generator is invalid, allow the user to change the generator without deleting the cache by hand.

ERR: Test for ansi streams may need to use iosfwd for test because some compilers provide an iostream header that is old streams.

ENH: Added KWSYS_FORCE_OLD_STREAMS option to force use of non-ansi stream headers even if they are available.

ENH: Added wrappers around the std stream headers to make them look like ansi streams on all platforms.

ERR: Search for getch instead of printf. Looks like printf is special so it does not work. getch does. Also when using -ansi, strdup is not defined. Make sure to use _BSD_SOURCE on all sources that use strdup