TACACS+ is now in the v4.0.x branch

I've just committed a patch to add TACACS+ to the v4.0.x branch: https://github.com/FreeRADIUS/freeradius-server/commit/6a59647304955d984f2ed... It's experimental, and works in basic tests. Minor things in the configuration are likely to change as we update v4, but the basic TACACS+ functionality should remain the same. Thanks to Alexander Clouter for doing the work. He had to read the TACACS+ proposed standard document, and figure out what it said: not much... The implementation is inter-operable with the switches we have access to, but you never now. People interested in trying the bleeding edge can now use TACACS+ in the v4 branch. Alan DeKok.