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.

_recidive_ filter will need to be changed. I don't think _recidive_ becomes completely obsolete, as there is cases where you want certain actions only to take place for repeat offenders (like X-ARF reporting). Maybe there needs to be an option on actions, such that they only execute once a minimum number of bans has occurred.

 I'm not against changing the log line, as I think given the ban times now varies, it's good to add the information.