bauerbill and bb-wrapper completions

[In-line]

It inherits some arguments from powerpill, so it is related to #548
Output of bauerbill -h and bb-wrapper -h:

USAGE
  Bauerbill.py [Bauerbill.py options] [pacman args]

OPTIONS
  Bauerbill.Py should accept the same arguments as Powerpill, e.g.

      Bauerbill.py -Syu

  See "pacman --help" for further help.

  The following additional arguments are supported:

    --aur
        Enable AUR support.

    --aur-only
        Enable AUR support and limit some operations such as system upgrades to AUR packages.

    --bb-config <BB-CONFIG>
        The bauerbill JSON configuration file.

    --bb-quiet
        Suppress warning messages for AUR operations.

    --build
        Build target packages that can be built.

    --build-all
        Build targets and dependencies.

    --build-dir <BUILD-DIR>
        The directory in which to save generated scripts.

    --build-vcs
        Rebuild all rebuildable VCS packages (e.g. foo-git, bar-hg)

    --nobqd
        (no build queue deps) Do not install calculated sync deps for build queue directly. Use this option to allow makepkg to handle all sync deps. The advantage is that the build scripts can be generated without root. The disadvantage is that some deps may be installed and removed multiple times if they are required by multiple build targets.