Also match Windows version of paths

This should fix unhelpful stack traces on Windows.

python 3 fix in dnn.py

In python 3, map returns a map object iterator rather than a list, which here gets consumed by min, leaving pad_desc empty.
This bug was just introduced with the update to cudnn v3.

Make pydotprint work with pydot_ng

The problematic line was "if not pydot_imported:",
try/except statements are OK

This is necessary to work on Windows, and for Python 3

Exempt np.random.mtrand.RandomState from NaN/inf/big_number checking in NanGuardMode.

enable dots in section names

Fix time_once and guess_once CuDNN options

Config parameters in CUDNN v3 have more than one hierarchy level
(i.e.dnn.conv.algo_fwd). This patch allows to override these values
within .theanorc

Cudnn doc fixes and drop support for CuDNN v1

Clearer error message for missing pydot/graphviz.

Fix copy/paste bug for cuDNN time_on_shape_change mode

Fix metaoptimizer for cudnn

Fix GpuDnnConvGradI not being inserted automatically

CuDNN v3