Fix

This is a strange case as we restect the 256 bytes limits!

fix test in float32.

added arccos

Deprecated cache entries now trigger a warning

Most people should have updated their local cache by now. Making it a
warning will ensure we notice if for some reason a bug generates new
invalid cache entries.

Misc style fixes in op.py

Functions for clean interactive debugger code

interactive debugger

Deprecated tensor.shared (renamed tensor._shared)

STY: various blas/test_blas fixes

Most of the time people who use tensor.shared do it because they mix it up
with theano.shared. By renaming it with a leading underscore, this confusion
should disappear.

By the way this commit also changes a few calls in Theano code from
tensor.shared to theano.shared, when I thought calling tensor.shared was not
intentional.

Fix missing pydot (tests/error message)

Dot22 complex still w pep8 errors but Fred's busy.

fixed cifar example.

Tensor cast error is clearer and has helpful hint.