Manifest groups may be empty, so don't abort in this case (fixes
issue210).
Only abort on empty changelog and file revlogs.
Pass filename to decoder for 'hg archive' (fixes
issue267)
Despite writing to a file descriptor, the check in the
[decode] section needs a filename.
localrepo.wwrite() still writes to the file descriptor.
various fixes to darcs conversion script
1. removed files were missed
2. hidden files in top directory were not added/removed correctly
3. suppressed spurious warning on adding new files.
4. hg changeset now checked in with original author and date
5. __file__ not supported by pdb.py