tests/test-backwards-remove.t

templatekw: add 'currentbookmark' keyword to show current bookmark easily

Before this patch, complicated template expression below is required
to show current active bookmark if it is associated with the
changeset.

    "{bookmarks % '{ifeq(bookmark, current, \"{bookmark}\")}'}"

This patch add 'currentbookmark' keyword to show current bookmark
easily.

  $ hg init
  $ echo This is file a1 > a
  $ hg add a
  $ hg commit -m "commit #0"
  $ ls
  a
  $ echo This is file b1 > b
  $ hg add b
  $ hg commit -m "commit #1"
  $ hg co 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

B should disappear

  $ ls
  a