tests/test-rebase-issue-noparam-single-rev.out

prepush: add more precise error messages

Part of the patch is from [e-mail]

- indicate the branch name where there are multiple heads
- give better advice when hitting a possible race, where new heads are added
  between discovery and the call to branchmap(). In that case, asking the user
  to merge isn't helpful, since only remote has the changes.

0 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
@  4:r2
|
o  3:r1
|
| o  2:l1
|/
o  1:c2
|
o  0:c1


% Rebase with no arguments - single revision in source branch
1 files updated, 0 files merged, 2 files removed, 0 files unresolved
saving bundle to 
adding branch
adding changesets
adding manifests
adding file changes
added 3 changesets with 3 changes to 3 files
rebase completed
@  4:l1
|
o  3:r2
|
o  2:r1
|
o  1:c2
|
o  0:c1

0 files updated, 0 files merged, 2 files removed, 0 files unresolved
created new head
@  4:r1
|
| o  3:l2
| |
| o  2:l1
|/
o  1:c2
|
o  0:c1


% Rebase with no arguments - single revision in target branch
2 files updated, 0 files merged, 1 files removed, 0 files unresolved
saving bundle to 
adding branch
adding changesets
adding manifests
adding file changes
added 3 changesets with 3 changes to 3 files
rebase completed
@  4:l2
|
o  3:l1
|
o  2:r1
|
o  1:c2
|
o  0:c1