MPDRoot uninstallation

Hello,
it is possible from now on to automatically uninstall CVMFS based installation

https://mpdroot.jinr.ru/running-mpdroot-on-local-machine-using-cvmfs/

Cvmfs service container, local cache, and the toolbox container are removed from your local PC by typing:

./nica-init.sh uninstall

Developers must additionally clean their MPD installation directory:
rm -rf $MPDROOT