ENH: SplitPath now supports slashes in both directions in the input path but still produces forward slashes in the root component.

ENH: Re-implemented CollapseFullPath to not need to change directories.  Operation is now fully string based.

ENH: Adding kwsys::SystemTools::FileTimeCompare method to compare file modification times with the highest resolution possible on the file system.

ENH: Initializing translation map using the PWD environment variable and getcwd functions to automatically translate logical paths involving the current working directory.  Also added the JoinPath method to aid users of the SplitPath method.