Catch a RuntimeError during item type guessing

CCP's server likes to do internal server errors it seems.
check_industryupdate.sh: New file.

For some reason, industryupdate cron jobs can pile up, blocking
the database and just blocking everything. I haven't found out why,
so clean them regularly with this script.
check_industryupdate.sh: Fix syntax error.
update_*: Encode names in utf-8.

For some reason, the DB layer doesn't like unicode strings. Meh.
Small fix in check_industryupdate.sh to avoid false positives
Update DB update instructions