[MERGE][#84763] Expanded log help

[Ian Clatworthy]

This patch updates the help for log to be useful. :-)
In particular, it explains some of the recently added
functionality.

The output from 'bzr help log' is attached.
The resulting User Reference can be seen here:
http://people.ubuntu.com/~ianc/doc/en/user-reference/bzr_man.html#log.

Ian C.
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