convert: some tidyups, doc improvements, and test fixes
The various back end options are now documented.
The hg source can now be configured not to hand out a revision ID.
% create cvs repository
% create source directory
% import source directory
N src/a
N src/b/c
No conflicts created by this import
% checkout source directory
U src/a
U src/b/c
% commit a new revision changing b/c
checking in src/b/c,v
% convert fresh repo
initializing destination src-hg repository
connecting to cvsrepo
scanning source...
sorting...
converting...
2 Initial revision
1 import
0 ci0
updating tags
a
c
c
% convert fresh repo with --filemap
initializing destination src-filemap repository
connecting to cvsrepo
scanning source...
sorting...
converting...
2 Initial revision
1 import
rolling back last transaction
0 ci0
updating tags
c
c
2 update tags files: .hgtags
1 ci0 files: b/c
0 Initial revision files: b/c
% commit new file revisions
checking in src/a,v
checking in src/b/c,v
% convert again
connecting to cvsrepo
scanning source...
sorting...
converting...
0 ci1
a
a
c
c
c
% convert again with --filemap
connecting to cvsrepo
scanning source...
sorting...
converting...
0 ci1
c
c
c
3 ci1 files: b/c
2 update tags files: .hgtags
1 ci0 files: b/c
0 Initial revision files: b/c