bookmarks: rewrite comparing bookmarks in commands.summary() by compare()
This patch adds utility function "summary()", to replace comparing
bookmarks in "commands.summary()". This replacement finishes
centralizing the logic to compare bookmarks into "bookmarks.compare()".
This patch also adds test to check summary output with
incoming/outgoing bookmarks, because "hg summary --remote" is not
tested yet on the repository with incoming/outgoing bookmarks.
This test uses "(glob)" to ignore summary about incoming/outgoing
changesets.
$ rm -rf a
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Am0
adding a
$ hg tag t1 # 1
$ hg tag --remove t1 # 2
$ hg co 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg tag -f -r0 t1
$ hg tags
tip 3:a49829c4fc11
t1 0:f7b1eb17ad24
$ cd ..