#530 Poor hash function

[Valeriy V. Argunov]

There are a lot of

14-10-10 13:38:04,693 (MCUTest.Blank) ERROR MCU::Commands:10212 collect.cxx(1164) PTLib Poor hash function used, more than 80% of 285 items in same bucket for class class PDictionary<class PGloballyUniqueID,class="" OpalMixerNode="">
14-10-10 13:38:04,694 (MCUTest.Blank) ERROR MCU::Commands:10212 collect.cxx(1164) PTLib Poor hash function used, more than 80% of 360 items in same bucket for class class PDictionary<class PGloballyUniqueID,class="" OpalMixerNode="">
14-10-10 13:38:04,694 (MCUTest.Blank) ERROR MCU::Commands:10212 collect.cxx(1164) PTLib Poor hash function used, more than 80% of 361 items in same bucket for class class PDictionary<class PGloballyUniqueID,class="" OpalMixerNode="">

messages in the log file.

[Robert Jongbloed]

I have checked in a possible fix, but any suggestions you have for a better hash function will be gratefully accepted!