[MERGE] new formatting of `bzr plugins` output.

[Alexander Belchenko]

I rework formatting of `bzr plugins` output.
Now I think it's much better for eyes of human beings.

Before:

C:\work\Bazaar\mydev.packs\bzr.dev>python bzr plugins
work\Bazaar\mydev.packs\bzr.dev\bzrlib\plugins\launchpad [unknown]
         Launchpad.net integration plugin for Bazaar.
work\Bazaar\plugins-repo\bzrtools [1.1.0]
         Various useful plugins for working with bzr.
C:\work\Bazaar\plugins-repo\win32symlinks [0.92.0]
         Fake symlinks support for win32 (NOTE: slow on FAT32!)
C:\work\Bazaar\mydev.packs\bzr.dev\bzrlib\plugins\multiparent.pyc [unknown]
         Implementation of multiparent diffs for versionedfile-like storage

Now:

C:\work\Bazaar\mydev.packs\plugins.output>python bzr plugins
bzrtools 1.1.0        Various useful plugins for working with bzr.
                         C:\work\Bazaar\plugins-repo\bzrtools
launchpad             Launchpad.net integration plugin for Bazaar.
                         C:\work\Bazaar\mydev.packs\plugins.output\bzrlib\plugins\launchpad
multiparent           Implementation of multiparent diffs for versionedfile-like storage
                         C:\work\Bazaar\mydev.packs\plugins.output\bzrlib\plugins\multiparent.py
win32symlinks 0.92.0  Fake symlinks support for win32 (NOTE: slow on FAT32!)
                         C:\work\Bazaar\plugins-repo\win32symlinks


Also for python modules plugins (like multiparent.py) plugins.path()
now returns path to python source file (*.py) instead of compiled bytecode (*.pyc).
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