I added an implementation of C-functions "sgemm_" and "dgemm_" that call Numpy C-API functions to perform matrix product when BLAS is explicitely disabled (with theano flag "blas.ldflags" set to empty).

This can be tested with:
THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/nnet/tests/test_abstract_conv.py:TestCorrConv2d

Somewhat smaller/faster 3d convolution tests

A few small update.

Scan with Checkpoints (part 2)

Fix a change to gpuarray conv from gh-5069. dnn conv wasn't working a…

32bit

Cudnn RNN bindings.

Make device=gpu with floatX=float16 raise an error (cause many user q…

Make device=gpu with floatX=float16 raise an error (cause many user questions and this should never be used). if floatX=float64, raise an error.

fix tests in mode=FAST_COMPILE

GpuCorrMM and GpuCorr3dMM in new backend