Merging Fernando's trunk (fp-trunk-dev) and Brian's edits (fp-review)....
Merging Fernando's trunk (fp-trunk-dev) and Brian's edits (fp-review).
This is a huge merge of months worth of work by Fernando and Brian.
Some highlights:
* The test suite has been ported to use the new APIs.
* The test suite runs and passes on all platforms!!!
* The IPython Sphinx directive has been updated to use the new APIs.
* %history works again.
* New %tb magic for showing last traceback.
* Significant design improvements in the config loaders and applications.
* Zillions of bugs fixed.
* Completely new %pylab implementation that uses the new GUI support.
This allows pylab to be enabled *at runtime*.
* Many other things.
