#22 NG crashes when opening database

[Martijn Saly]

I just had this (and solved it). Every single time I opened
a NG database, it crashed like there is no tomorrow. I
tried to debug the source (which is very complicated by
the way), and it turned out the check of the database
goes wrong. Ultimately some bad pointer is extracted
from a hashtable and the whole collapses.

So I decided to delte the filecrc.db file and after that it
working fine again (as far as NG can be fine, see previous
bugreports ;))

So I gues a seriously corrupted CRC database is deadly
for NG, even though it should be able to detect
corruptions in the CRC database...