readying 2.02
optimized up create_ackrc
It's now actually first 250 chars, not 100.
Documentation changes (for issue #159).

This contains fixes for most of issue 159 (the parts I could actually
do).

- Fixed consistencies between --help and --man
- Clarified default for -H option
- Change all occurrences of REGEX in man to PATTERN
- Changed to --[no]group style throughout man, except where the positive
  option requred an argument (e.g. --pager=program and --nopager, and not
  --[no]pager=program)
notes about what has changed