[PATCH 0 of 2] Make import and export handle branch information.

[hopper at omnifarious.org]

These patches add some simple support to import and export so they can
be used to propogate information about branches.

These changes can be pulled from:

http://hg.omnifarious.org/~hopper/merc-tocrew

Thanks,
-- 
"It does me no injury for my neighbor to say there are twenty gods or no God.
It neither picks my pocket nor breaks my leg."  --- Thomas Jefferson
"Go to Heaven for the climate, Hell for the company."  -- Mark Twain
-- Eric Hopper (http://www.omnifarious.org/~hopper) --
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