[cvsnt] Version number change

[Tony Hoyle]

To avoid ambiguity it has been decided to slightly modify the current 
cvsnt release version numbers.

The current 2.5.02 will be renamed to 2.6.01.  This is the release that 
contains the new core, rename and database storage, slated for release 
later this year.

The next stable release will be 2.5.02, based off the current 2.5.01 
once it has properly stabilised.  This is now sufficiently different to 
the released 2.5.01 that is was felt that to release it as mere service 
release be would confusing.

Tony