argparse: use argparse version action
argparse: use %(default)s whenever we can
argparse: use ArgumentError
argparse: remove last optparse uses in non-convert tools
argparse: move to argparse HelpFormatter
argparse: fix --help testing
argparse: more parse_args cleanups
argparse: turn input and output into positional arguments
argparse: more change options to args
argparse: parse_args ouputs only args
argparse: fix text_help
argparse: only use default keybawrds in help
argparse: adapt test to positional arguments
Hack: attempt to get test_pogrep wotking
argparse: s/options/args/
argparse: more removal of options, args for just args
argparse: more options, args to just args
argparse: add searchstring pos arg, drop special in/out handling
Hack: drop optrecurse special in/out handling, most of it
argparse: convert listfilter to store_true