Contributed by Erik Sornes. No side-effect for v1.2 NTFS which is still
the default. The implementation needs some minor work: see e.g. the chkdsk
messages and the result of ntfscmp'ing the two images.
currently it's #ifdef'd out.
tree.c - code for handling directory trees
rich.c - a few helpers without a home (this file will go away soon)
Note: ntfsrm isn't in the build any more (you need to ./configure --enable-rich; make extras). When rm is less intrusive, again, I'll put it back in the build.