speeding up commits

[Martin Pool]

On  7 Dec 2005, duchier at ps.uni-sb.de wrote:
> I just tested an idea to speed up commits and on my test example it
> brings the time spent in read_weave_v5 from 40s to 11s:
> 
> find_previous_heads invoked by Commit._store_snapshot is given a weave
> argument (which must be read from the store).  However, it does not
> need a full weave: it needs only the prelude, not the actual weave of
> lines.  Reading just the prelude speeds things up noticeably.

Very nice.  Applied.

Please think about adding new unit tests when you add new APIs - like
get_weave_prelude_or_empty.

-- 
Martin
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