Fix: Allow patients to be sent to the research room only if the corresponding room is not yet researched (but not if it is researched but not built).
Codechange: Restructured fax dialog code a little bit.

git-svn-id: http://corsix-th.googlecode.com/svn/trunk@1851 c39591fa-788f-11de-a72b-d90af8dea425