- The (empty) created collection is now deleted after import failure
- Sped up general DB performance dramatically (especially on XP and Linux) by using a dummy statement to keep the SQLite shared cache active between transactions -- this seems to have only a moderate effect on OS X, which was already much faster, perhaps because of its own disk cache (though running XP and Linux under Parallels with limited RAM probably didn't help)
- Added some additional sanity checks to Date.strToDate() to prevent errors in the metadata pane and on import with dates like "1998-99" -- strToDate() was treating 99 as the month, which caused an error in the stricter DB trigger. "99" is now left as an unparsed part, though "2006-08" (where the second part is <= 31) will still get parsed as August 2006. Can't do much about that, though.
- Fixed a bug when rolling back nested transactions that could temporarily leave things somewhat funky
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