Ban time incr

New feature "automatically exponential increasing ban time".
WARNING: by first start the server upgrades sqlite database (table "bans" will recreated with another schema);
Option "bantime.increment" in jail.conf allows to use database for searching of previously banned ip's to increase a default ban time using special formula, by default each next ban increase banTime * 1, 2, 4, 8, 16, 32...
see "jail.conf" for some other options of "bantime.___";
additional we can configure a little randomization of ban time, to prevent "clever" botnets calculate exact time IP can be unbanned.

updating 3rd party tools (I do provide backports of fail2ban for older debian/ubuntus -- should I also now maintain there logwatch? thanks - I would prefer not to) might be a pain in the butt so I would strongly prefer to keep old one available, and then you can spit out all the gory details at .debug level if you care.