[cvsnt] Latest updates

[Tony Hoyle]

cvsnt 2.0.51 (stable)

* Documentation updates

Here it is at last (f/x crosses fingers).

The rename functionality is still disabled by default & unfinished, but 
everything else seems to work.

People are welcome to test rename & feedback problems with it though 
please don't test it on critical repositories as it does change 
behaviour of the server once it's been used.

Upgrading to the new repository aliases should be automatic.  Users are 
encouraged to check in the control panel that their prefix has been 
applied correctly.

Tony