tests/test-merge-force.out

branch closing: mark closed branches with a 'close' extra

Adds a --close-branch option to commit.
When --close-branch is present the commit will mark the changeset
with close=1 in the changeset extras field.

If a regular changeset is added on top of a closed head the branch
is no longer considered closed, and thus re-opened.

created new head
% local deleted a file, remote removed
abort: outstanding uncommitted changes
resolving manifests
removing a
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
(branch merge, don't forget to commit)
% should show a as removed
R a
% manifest. should not have a:
b