ENH: Added --check-rerun option to allow a runtime check of whether a new generate should really be done.

ENH: Added FileTimeCompare method to compare file modification times.  Currently the resolution is limited to one second.

ENH: If dart or ctest are not found, use ctest. For default drop location etc, support http submit (just set DROP_METHOD to http. Only look for tclsh if DART_ROOT is set

ENH: Support not writing files to the source tree. Generate single project file for whole project, some other little cleanups