Bit-twiddling

Discovered this evening that my research database had got corrupted, and ended up having to restore it by manual inspection of the damaged file, plus a backup dating from December.

Not quite as bad as it sounds, since I haven't actually done much research since December... but it rather ate up the hours I was planning to spend tonight in indexing what I'd already done, in preparation for carrying on tomorrow where I'd left off some months previously...