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.

getTime2 name is clearly non-descriptive.  Either fold this logic into getTime, or rename 'getTime' into e.g. 'guessTime' and this one into 'getTime'.  Even here -- move 'if date is not None' at the level of 'date =' since otherwise how could it become non-None? remove ```date=None```