tests/test-revert-flags.t

help: provide help of bad alias without executing aliascmd()

The output is slightly changed because of minirst formatting.  Previously,
ui.pushbuffer() had no effect because "badalias" message was written to stderr.

"if not unknowncmd" should no longer be needed because there's no call loop.

#require execbit

  $ hg init repo
  $ cd repo
  $ echo foo > foo
  $ chmod 644 foo
  $ hg ci -qAm '644'

  $ chmod 755 foo
  $ hg ci -qAm '755'

reverting to rev 0

  $ hg revert -a -r 0
  reverting foo
  $ hg st
  M foo
  $ hg diff --git
  diff --git a/foo b/foo
  old mode 100755
  new mode 100644

  $ cd ..