BloscpackArgs object
fix the BloscpackArgs object
fix use of BloscpackArgs in pack and co
fix test_append.py
fix remaining tests
a simple test of the BloscpackArgs object
fix all the command line stuff
remove trailing whitespace in abstract object
don't put the comma in pformat, use __repr__ for roundtrips
fix some typos
update the README
Merge branch 'feature/BloscpackArgs'

* feature/BloscpackArgs:
  update the README
  fix some typos
  don't put the comma in pformat, use __repr__ for roundtrips
  remove trailing whitespace in abstract object
  fix all the command line stuff
  a simple test of the BloscpackArgs object
  fix remaining tests
  fix test_append.py
  fix use of BloscpackArgs in pack and co
  fix the BloscpackArgs object
  BloscpackArgs object