VM: make tightvnc the default VNC viewer in Windows
GUI: cancel sudo dialog in one session
GUI: don't use sudo for "ip" command
PCMK: don't use corosync status commands in hb clusters and vice versa

so they don't need to be allowed for sudo
GUI: use the same sudo pwd in the sequence of commands
add commands to README needed for sudo
GUI: ask for sudo password if it failed

in some configurations the root password is needed for sudo
DRBD: add tooltips to the network/port fields
DRBD: make inside proxy address an advanced field