[MERGE] Tweak log -n UI to support +/- as fully expanded/collapsed

[Ian Clatworthy]

As the most common use cases for log's new -n option are:

* show me all levels of nested revisions
* show me just the top level

I think it's worth having the + and - symbols as aliases
for 0 and 1 respectively. A small patch enabling this is
attached.

Ian C.
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