[PATCH] Speed improvement

[Aaron Bentley]

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Goffredo Baroncelli wrote:
> 1) The patch add a hash ( file_ids_names ) which caches the revision 
> contained in a weave already  processed, so it isn't needed to reload the
> weave in order to check if a revision is present.

The actual list of revisions in the weave header looks reasonably cheap
to read.  Maybe we just need a way to read the header only.

Aaron
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