Customizing the help output

Here's some typical output that comes directly from the default argparse.print_help() code:

usage: p3_c16.py [-v] [--debug] [--dealerhit {Hit17,Stand17}]
                 [--resplit {ReSplit,NoReSplit,NoReSplitAces}] [--decks DECKS]
                 [--limit LIMIT] [--payout PAYOUT]
                 [-p {SomeStrategy,AnotherStrategy}]
                 [-b {Flat,Martingale,OneThreeTwoSix}] [-r ROUNDS] [-s STAKE]
                 [--samples SAMPLES] [-V] [-?]
                 output

Simulate Blackjack

positional arguments:
  output

optional arguments:
  -v, --verbose
  --debug
  --dealerhit {Hit17,Stand17}
  --resplit {ReSplit,NoReSplit,NoReSplitAces}
  --decks DECKS
  --limit LIMIT
  --payout PAYOUT
  -p {SomeStrategy,AnotherStrategy}, --playerstrategy {SomeStrategy,AnotherStrategy}
  -b {Flat,Martingale,OneThreeTwoSix}, --bet {Flat,Martingale,OneThreeTwoSix}
  -r ROUNDS, --rounds ROUNDS
  -s STAKE, --stake STAKE
  --samples SAMPLES
  -V, --version         show...