tests/test-rebase-keep-branch.out

merge: introduce tool.check parameter

tool.check is a list of check options, and can be used in place of
tool.checkchanged and tool.checkconflicts:

Equivalences:
tool.checkchanged = yes
tool.checkconflicts = no
tool.check = changed

tool.checkchanged = no
tool.checkconflicts = yes
tool.check = conflicts

tool.checkchanged = yes
tool.checkconflicts = yes
tool.check = changed, conflicts

Add _toollist() wrapper for ui.configlist() to implement this consistently.

checkchanged and checkconflicts are still supported, but check is
preferred for implementing new check options.

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


% Rebase a branch while preserving the branch name
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 1 changesets with 1 changes to 1 files
rebase completed
@  4:r1:notdefault
|
o  3:l2:
|
o  2:l1:
|
o  1:c2:
|
o  0:c1:

% dirstate branch should be "notdefault"
notdefault