Adds the ability to have more than one nurse in the ward.
Just add more desks, and you can have as many nurses you want.
The patients get cured a little faster when there is more nurses present.

Ref: Issue 1597.

Thanks, Mark!

git-svn-id: http://corsix-th.googlecode.com/svn/trunk@2325 c39591fa-788f-11de-a72b-d90af8dea425
This patch takes into account when a loo becomes free and lets another patient enter the room to use it (even if there is a long queue for the sink).
If there is a queue for the sinks there is a chance the patient will leave without washing their hands - but will not be happy about doing so.
Also removed the warning when a patient enters the room and there are no free loos. This can happen now if two patients enter the room close to each other and were heading for the same loo, now one waits a few seconds and then just leaves to join the queue.

Ref: Issue 773

Thanks, Mark!

git-svn-id: http://corsix-th.googlecode.com/svn/trunk@2326 c39591fa-788f-11de-a72b-d90af8dea425