use floatX in gpuarray dnn tests

Pool 2d rename

Add profiling of which node make_thunk take times.

Issue 5008 fixed

Add bool dtype in scalar and tensor.

Fixed typo in config doc

make var() return float16 when input is float16.

Use "PyArray_Transpose" in gemm implementation

Add a test to test_blas.py:TestBlasStrides to check
is gemm works well with non-contiguous matrices
(A,B,C are all passed as non-contiguous).

All tests passed ! Recall: these are the tests executed:

theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/nnet/tests/test_abstract_conv.py:TestAbstractConvNoOptim
theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/nnet/tests/test_abstract_conv.py:TestBilinearUpsampling
theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/nnet/tests/test_abstract_conv.py:TestCorrConv2d
theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/nnet/tests/test_abstract_conv.py:TestCorrConv3d
theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/nnet/tests/test_abstract_conv.py:TestCpuConv2d
theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/nnet/tests/test_abstract_conv.py:TestCpuConv3d
theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/tests/test_blas_c.py
theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/tests/test_blas.py
theano-cache purge && THEANO_FLAGS=blas.ldflags= nosetests theano/tensor/tests/test_blas_scipy.py
theano-cache purge && THEANO_FLAGS=optdb.max_use_ratio=10,blas.ldflags= nosetests theano/tensor/nnet/tests/test_corr3d.py
theano-cache purge && THEANO_FLAGS=optdb.max_use_ratio=7,blas.ldflags= nosetests theano/tensor/nnet/tests/test_corr.py

Gemm implementation rewritten so that a new data memory
is allocated when we can not reuse C.

C can not be reused either when BETA != 0,
or when BETA == 0 but C is not contiguous
(LDC != M).

All tests passed, + special test suggested by lamblin.

pool.py and test_pool.py respect the flake8 norms. corrections have for the test_pool have been made in order to include more deprecation examples.

Insert GpuSolve only when CULA is available

Doc update about cudnn and cudnn RNN.

Code-comment removed from test_corr.
Code factorized in alt_gemm_template.c

All tests passed.

Some commented codes about empty ldflags have been removed
and replaced with normal comments.

Some changes are made in alt_gemm_template.c relative to
last recommendations.

Functions parameters have been modified in pool.py for coherence purposes. Deprecation warnings and exceptions have been added in order to deal with all possible scenarios.

Functions parameters have been modified in test_pool.py for coherence purposes. The test also contains some examples where it should print a deprecation warning. For that, you should use the following command: nosetests -s test_pool.py.

Functions parameters have been modified in pool.py for coherence purposes. Deprecation warnings and exceptions have been added in order to deal with all possible scenarios.

Fix a problem where the samples buffer would not be filled.

Closes #4933.