Fixup for the jail Time Calulcator

isnumeric relies on KRON's functions which are not available this early
in the init and this looks better anyway ^^
To reduce network traffic we handle local stuff locally
Fix up for #30

we dont attempt do divide 0 anymore, fixed up the check for when a
invalid bounty value gets submitted when updating the player bounty and
actually registered the function so it can be used.
Reverting #65 - I figured out what the code is for, see comments