Improve MissingInput message

Sphinx doc/conf: latex_font_size is deprecated

* Add info on which input of the node has not been provided as input of the function

Port erfinv and erfcinv to new backend.

Make join work inplace

Fix opt crash

Update NEWS_DEV.txt and .mailmap

Python2 3

Create GpuErfinv and GpuErfcinv. Make sure
these GPU ops return the same values as
CPU (scipy.special) equivalent ops.

Update optimization to take account of these ops.

Optimization is applied only with CUDA device

(a warning message is printed if OpenCL is used).

Add tests.

Skip another test when cxx isn't available.

Still merge identical Asserts while Assert merging is disabled

Try to get_scalar_constant_value for Assert nodes

Remove isnan from the graph for discrete dtype.

Although the fancy merging of conditions is disabled, identical Asserts
can still be combined. See #3344.

close file with context manager

Conda fixes

GPU gemv->dot speedup for new backend