DOC: 64 bits print 0 as 0L from vtk datasets

Work round printing difference between 32 and 64 bits for VTK datasets.
DOC: don't test uninteresting doctest

It was failing due to sympy printing, and it's not testing nipy code.
DOC: update AUTHOR and Changelog for release
DOC: update install instructions

Get us more focussed on binary installation when possible.
DOC: update README and info

* Note python 3 compatibility.
* Correct compatible versions in info.py
* Replace deprecated github downloads link with pypi
* Update ourselves to beta from alpha (high fives all round)
DOC: updating release instructions for buildbots

Making various checks and binary builds via buildbots.
REL: release 0.3.0

Update release version
MISC: start 0.3.x maintenance branch
MISC: start 0.4.0 development
MRG: -s ours merge of maint version changes

Mark version number changes from maint branch as merged, so we can merge from
maint later without conflicts.
DOC: note -s ours merge of maintenance branch

The -s ours merge allows us to merge later from the maintenance branch
if there's any useful work on there.
DOC: update copyright dates; note need to check

We need to update the year on the copyright dates from time to time.
DOC: reminder to update AUTHORs and THANKS
Merge branch 'maint/0.3.x' into main-master

* maint/0.3.x:
  DOC: reminder to update AUTHORs and THANKS
  DOC: update copyright dates; note need to check
  DOC: note -s ours merge of maintenance branch
Update doc/faq/johns_bsd_pitch.rst

add some fixes from http://mail.scipy.org/pipermail/scipy-user/2007-January/010602.html
Merge pull request #261 from endolith/patch-1

Update doc/faq/johns_bsd_pitch.rst

add some fixes from the version at http://mail.scipy.org/pipermail/scipy-user/2007-January/010602.html