Client Version

I've updated the code to reject clients other than 1.7.4.2, as it has quite a few improvements for the client over 1.7.3.[0|2]. These are:

* Timeouts for slow connections, instead of hanging the client
* GZip http compression for retrieving the ratings file
* Always running a bot that isn't in the ratings file if it shows up in the participants list - even if there are priority battles waiting. 1.7.3.0 would always run bots below 2000 battles, but this doesn't help, for instance, in the Gigarumble, while 1.7.3.2 ignored the 2000 battles limit and when no priority battles were available would run random battles until it stumbled on the new entry. This sometimes caused many hours wait before the server became aware that a new bot was available, now it is immediate.

I also fixed a bug in ''my'' code which prevented the priority battles from working correctly after all of the pairings were complete, instead just giving random battles, so there should be much faster post-pairings-complete stabilisation, and a much more even distribution of battles from pairing to pairing.