[cvsnt] Latest updates

[Tony Hoyle]

cvsnt 1.11.1.3 build 68

Fix double free bug in server (and implement measures to make sure it
can't happen again).
Mergepoint processing.
Bug fixes & some bulletproofing.

I wasn't going to release mergepoint processing in this release, but
since it's been so successful here I can't see any problems with it.
Now, when you do an 'update -j' the cvsnt client records the branch
that you merged from, and sends that back to the server when you
commit the merged files.  Subsequent 'updade -j' commands start from
that point in the branch, so you don't have to re-merge stuff you've
done before.

You can revert to the old behaviour (merge from the branchpoint) by
using the '-b' flag.

Tony