ENH: helper functions for HDF5<->datasets IO
Merge branch 'cmdline_modular' of github.com:hanke/PyMVPA into cmdline_modular

* 'cmdline_modular' of github.com:hanke/PyMVPA:
  NF: Compose ds attributes on the command line
  BF: Python 2.6 compat fix.
RF: Factor out common dataset attribute options.
RF: Get rid of common_args -> join helpers
RF: Relocate FSL mcpar processing again.
DOC: Improve help output
NF: Draft of a command to create event-related datasets.
ENH: Explicit option to invoke a post-mortem debugger
RF: Rename HDF5 compression option to avoid name clashes
DOC: Make help output more meaningful
NF: Add another command to export (dump) dataset components