[PATCH 3 of 3] Fetch revision log on demand (in batches of 50 revisions)

[Edouard Gomez]

Merged the convert_svn.rev method bit into ./svn/enh-add-svn-
converter.patch.

I advise putting the 50 revision fetching constant somewhere near the top 
so we can try a few values easily for big repos (mplayer > 23000 commits)

And the bad part:

The rest of the patch doesn't work for me on a very simple repo.

I uploaded the problematic svn repo at:
http://ed.gomez.free.fr/mercurial/rawstudio.repo.svn.tar.bz2

It's a svnsync of https://rawstudio.org/svn/rawstudio/

It breaks at fetching rev 1172.

-- 
Edouard Gomez