tests/test-rebase-abort.out

localrepo: remove 'closed' argument to heads(...) function

- repository heads are not associated with the closed attribute, so
remove it making the code in line with the concept.
- Fix functions that were calling heads with the parameter.
- Adjust webcommands.branches to include the concept of inactive
as well as open and closed branches
- Fix code and docstrings in commands to make the correct use of
closed branches & branch heads clearer
- Improve grammar of 'hg heads' help text (2nd submission)

this does not alter the cli for hg branches, that work is
still to be done

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
@  4: L2
|
o  3: L1
|
| o  2: C3
|/
o  1: C2
|
o  0: C1


% Conflicting rebase
merging common
warning: conflicts during merge.
merging common failed!
abort: fix unresolved conflicts with hg resolve then run hg rebase --continue

% Abort
rebase aborted
@  4: L2
|
o  3: L1
|
| o  2: C3
|/
o  1: C2
|
o  0: C1