Disable printing log file
Make email reports optional
Check VE private area existance before any actions
Autoexclude already defined VEIDs from default backup set

I need to backup all containers by default (CT list taken from vzlist),
and some containers should be backed ub in separate backup sets. Key
point is in not defining manually default backup set at each server.
Skip VE if it doesn't exists

Instead of fail, we need to just skip unexistent VEs defined in backup
set because we want the same VEID_{MONTHLY,WEEKLY} across all servers.
Implement custom per-VE excludes