[MERGE] Make the plugins command public with better help

[Ian Clatworthy]

Plugins are an important part of our system so I feel the command to
list them ought to be a public one. We show the plugin name in []
whenever 'bzr help commands' is given so I don't believe being able to
see the list of installed plugins ought to be reserved for expert users
only.

As discussed with Robert on IRC, I've improved the help as well. There
is scope for far more detailed help to be included as a new help topic
in the future but this change remains an incremental improvement without
that IMO.

Ian C.
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