[cvsnt] Latest updates

[Tony Hoyle]

cvsnt 2.0.58d

Since adding the debugging seems to have changed things enough so that 
it's working for more people I've made it into a proper release (it's a 
bit slower, that's all).

Future releases will probably have a purpose built file access system 
for Win32 to avoid this in the future.

There is no difference for the Unix builds (Unix isn't subject to the 
same problems, so doesn't need any special treatment).

Tony