Swapped ipython loading to use the piping command.

Also some code cleanup. Moving comments to appropriate place.
Removal of unused functions.
Added PBS support.
Added PBS documentation.
Merge branch 'master' of git://github.com/arq5x/gemini
Merge branch 'master' of git://github.com/arq5x/gemini
    Fixed restarting the cluster during loading.

    cluster is now started once, and the view to the cluster
    passed to the loading and recursive merge.
Replaced PBS support with Torque support.
Merge pull request #89 from roryk/master

IPython loading speedups
pep8
pep8
pep8
[ENH] added new query API for using Gemini dbs for tool dev.
rework the header interface
allow "from gemini import GeminiQuery" for use in scripts.
fix typo
improve API.  always provide genotype vectors.
Merge pull request #92 from udp3f/master

unit test added for interaction tool
use a version table to track which version of gemini was used to create a DB.
move to version 0.2.0b
cleanup header usage