Integration of Mercurial into LXR

[andre-littoz]

I have deeply restructured LXR storage backend at the light of what I understand of Mercurial concepts that are transposable to other storage engines.

With a careful choice of hg commands, there is now only one call (on average) to hg to get all the pieces of information LXR needs. That's done through co-routines and queues. This solves the performance issue on individual file access. It also has a beneficial speed-up effect on the other storage engines, too.

However, I'm still faced with the performance issue on directory retrieval. I've narrowed the questionable code area to 10-20 lines (in LXR). The analysis will be done later since I'll be away during a few days for business.

Regards,
André
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