This is one of the trickier relative to absolute convertions.  Some
of the initialization code had to be moved from tensor subpackage to
the main theano __init__.py in order to work around a circular dependency.

Update comment after code review.

Fix test and update NEWS.txt

We explicitly use and -inf in the graph, so DebugMode shouldn't complain about this.

The problem was caused by the name conflict between the scan submodule and the scan function.

This reverts commit 7fa448b8.

make filter for CudaNdarray check for stride == 0 for dim == 1.

Conflicts:
	theano/compile/function.py
	theano/compile/pfunc.py
	theano/gof/fg.py
	theano/gof/type.py