[MERGE] Move various weave specific code out of the base Repository class to weaverepo.py.

[Robert Collins]

This patch gets rid of some cruft that we put in for weaves in the
repository interface; moving it instead to the weaverepo format specific
location.

Due to the current subclassing structure in weaverepo.py there is some
duplicate code; but frankly I could not care less - its in our legacy,
deprecated, warn-on-use formats anyway.

With the changes in this, I have packs passing all tests again, there
are some other minor deltas, expect isolated patches for those shortly.
There are also some bigger changes, that I'm going to try to polish this
week.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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