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.