refactor help to __help_text to remove duplication of usage text
refactor help to __help_text to remove duplication of usage text

having fewer places to edit the same usage information, should make it
easier to keep it up to date.

Also reformatted some long lines to be <80 chars.

dlangille/iocage,sineer/iocage,skoef/iocage,moviuro/iocage,freqlabs/iocage,vtalk/iocage,sineer/iocage,lattera/iocage,sineer/iocage,skunkwerks/iocage,notdavidcronenberg/iocage