Trying to do something about #229

I found a simpler way to determine the BOR_PW_ENC value which was not available in a bug report (#229) from Hamburg Campuskatalog.
It still works in Kiel (the only PICA library where I have an account) but I don't know if it fixes the bug because if it isn't present in one location, it probably isn't in the other location, either.
BOR_PW_ENC seems to be some kind of hash of the password, but I haven't found out what hash function is uses, so we have to rely on finding it out from the parsed HTML.
Maybe you can contact the person who discovered the bug if he/she can send us the HTML source of the account page (directly after login) if this change doesn't fix the bug.