Fixes after code review

Refactor ViewOp, OutputGuard and DeepCopyOp.

They now live in theano/compile/ops.py.
Use a registry for C code and version associated to the types.

Update installation instructions for Windows

Move SparseType to its own file and import it even when scipy is not the...

0.6rc1

Flags

use profile_optimizer instead.

profile_optimizer replace it.

Use defaultdict instead of dict in memodict.

Python 2.4's dict ignores the __missing__ method, but we already
had an implementation of defaultdict in Python 2.4 that does.

Expand ~ in base_compiledir and compiledir.

Do not call expanduser on these config variables elsewhere any more.

Removed source of non determinism in tests

There was a loop on dictionary items that could cause tests of memapped
inputs not to be deterministic.

Fix py24

Correctly keep track of used tmp files

Minor stuff