tests/test-revert.out

Don't abort when backup files already exist. Don't allow alternative names.
Rationale:
- When the user wants to revert, he shouldn't be stopped from doing
  this just because some old backups will be overwritten.
- To not clobber important files by accident, alternative names for backup
  files were disabled. As the backup target now has a fixed name, the user
  doesn't have to be informed about the backup copy (unless --verbose)

%% should show b unknown
? b
%% should show b unknown and c modified
M c
? b
%% should show b added and c modified
M c
A b
%% should show a removed, b added and c modified
M c
A b
R a
%% should show b added, copy saved, and c modified
M c
A b
%% should show b unknown, b.orig unknown, and c modified
M c
? b
? b.orig
%% should show unknown: b b.orig
? b
? b.orig
%% should show a b b.orig c e
a
b
b.orig
c
e
%% should verbosely save backup to e.orig
saving current version of e as e.orig
reverting e
resolving manifests
getting e
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
%% should say no changes needed
no changes needed to a
%% should say file not managed
file not managed: q
%% should say file not found
notfound: No such file or directory