Fix buildbot

Make broadcast fixup in filter_variable() depend on an argument and stop doing it for shared variables.

The inner loop that would update the broadcastable pattern according
to the rebroadcast dict would overwrite the idx extracted from the
Subtensor, thus always selecting the last dim.

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