Skeleton awftools script.

awftools is a set of routines to facilitate working with queues in a
python shell.

This is a skeleton implementation, letting the user initiate a queue,
submit a job and list the current jobs.
Improved 'qstat_pretty' output.

It now prints something that looks vaguely like a table.

Added 'ioutils' module for utilities related to IO and printing.
Renamed awftools.py -> iawful.py.
Updated 'usage.md' to reflect new iawful frontend.

Removed all the information about hte Pyro server and the section that
suggested using Mdrunr directly. Added a bit of information about
using 'iawful' as an interactive interface.
Merge branch 'interactive' into develop