Cleaning up 'help' code so that it's easier to follow (and to set options for the
output generated by the OptionParser class used within Hanlon to parse the
CLI input); includes changes to the argument order of the 'parse_and_validate_options'
method in the slice class and changes to the 'model_help' method in some of the
slice objects (the model slice, for example) to change some of these 'optparse_options'
in the help generated within those objects.  Also includes a refactoring of the
'print_command_help' method in the slice class, breaking it up into two separate
methods (rather than determining what the banner printed should be based on whether or
not help is being requested for a 'subcommand'