Start the intro for the new tutorial
Should be \cdot, not \dot
Fix doctests
Get rid of (apparently unnecessary) ::
Finish up the intro
Address Sean's comments
Add a gotchas file to the new tutorial
Start work on preliminaries and simplification files for the new tutorial
Write some more of the simplification document
Add polynomial simplification stuff to the new tutorial
Hyperlink something
use2to3: Include all rst files from doc/src/
Remove old tutorial

This also removes all old translations, which are no longer relevant, but it
leaves the translation framework in place.

I haven't yet fixed any of the references to the old tutorial, because they
will need to be modified to point to the new tutorial.
Add bit about installation and SymPy Live to preliminaries
Write sections on trig and power simplification
Add note to preliminaries about mathematical background
Address Sean's comments
Write some more of the tutorial
Add basic operations section
Use better variable names in the intro