use REPOSITORY-THRESHOLD instead of {CVS,SVN,GIT]-THRESHOLD

[Kok, Auke]

Christian Riggenbach wrote:
> hi list
> 
> attached is the patch to use -one- variable for the update-threshold of 
> repositories. the old thechnique was to use {CVS,SVN,GIT]-THRESHOLD, but only 
> CVS-THRESHOLD was configured in the download-menu.
> 
> the missing patches are plugins for the git, subversion and cvs modules and 
> are in the queue.

comitted this to both lunar+theedge