3D separable convolutions

Fix test in the daily buildbot and make sure to don't loose the current linker.

Attempt to lock PR tests to the specific version of libgpuarray that they require.

Add covariance matrix function theano.tensor.cov

Fix a failing test in DebugMode by making DebugMode pickable. Now _Maker do as FunctionMaker, it use the normal pickle system.

Specifying culprit node in `MissingInputError`

Spatial Transformer Network Ops using cuDNN

Add g++ "-WL,-rpath" argument for CTC ops.

separate copying inputs and copying orphans

Adding tensor6 and tensor7 constructors

Update conv doc.

phase out outdated conv3d