BUG: Need to include header <new> to use placement new syntax.  Really this should be fixed by replacing the stream buffer to set a new string instead of reconstructing the object, but this will require quite a bit of work to do portably.

BUG: add a test for a single char dir, and fix bug introduced in 1.53, but we still can not handle a space as the start of a directory name

ENH: Add method to retrieve parent directory and for checking if directory is a subdirectory of another directory

ENH: Move permissions code to kwsys so that copyfile can use it. Fixes Bug #1133 - cmake -E copy file dir sets the wrong permissions on the destination directory

ENH: Move callback structure out of the public interface. Also block the warning on Visual Studio Debug