Added some new features to slice up the import from remote CVS via local CVS

Added some new features to slice up the import from remote CVS via local CVS
a couple of different ways.  But the real change was preventing rsync from
modifying the permissions of incoming files.  This fixed the problem where
our local git derived via --localcvs had different commit hashes that the
remote git repo at http://hinrg.cs.jhu.edu/git/.  Now, as long as enough
memory is present, the local git and remote git have exactly the same contents
and same commit hashes.