some optimisations and fixes a few cursor timeouts
added a new index (run ensure_indexes again)
fix endless recursion in post_date if swaths of articles have been removed
fixed an index
fix #30: skip headers that are missing data
fix #31: add retries to backfill, fix problem with retries in normal scan
fix #32: skip along broken sections faster, don't entirely die if a broken region is encountered during group initialisation
fix #32: remove erroneous backtrack
reduced batch size to prevent mongo cursor timeout - shouldn't really affect speed
added jsonp support to api
jsonp output should still be json, not python dicts
correct jsonp content-type output just in case something complains loudly
modify json output to not include @'s for xml attrs
missed a code path from last commit
added a script to clean releases that have nzbs containing no files (relatively few, I had 2 releases out of 800k)
modified postprocessing so it works from newest to oldest, improved nfo hit rates and fixed a segfault that happened annoyingly often
added missing support for -d on backfill.py, allowing you to backfill to a certain date
added usenet group output to api pages
changed the location and name of the group attribute so it's easier to get at through jsonp
Merge pull request #36 from bettse/master

Remove quotations from logging output