COMP: Adding work-around for CMake dependency scanning limitation.  Any configured header included by KWSYS_HEADER() in a .c or .cxx file in kwsys itself must use this hack to get dependencies.

ENH: Split kwsys_std into kwsys_ios and kwsys_stl in order to avoid std namespace pollution and support more platforms.

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