tests/test-chg.t

dispatch: make cmdalias forward command attributes to function

This delays resolution of command attributes so that missing attributes
can be warned only when necessary.

init repo

  $ hg init foo
  $ cd foo

ill-formed config

  $ hg status
  $ echo '=brokenconfig' >> $HGRCPATH
  $ hg status
  hg: parse error at * (glob)
  [255]