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.

I have sorted my thoughts about this:
Other options like a "factor" etc. makes easy changing of some jail separately, for example without changing a master multipliers or other default values. For example, I can set "maxtime" bei mail-jail to 1 week, and leave it for ssh-jail by 2 hours (if I use a certificate it is enough). I would like to be just flexible (all the parameters has a default values, and must not be reconfigured). I have already used it in production and have for me a good reasons for all the parameters here.