[WIP] Use __call__ instead of make_node to avoid bypassing test values

Cleanup numpy min version

Fix warning/detection on tx1. I suppose it is an update to there comp…

Improve MissingInput message

Sphinx doc/conf: latex_font_size is deprecated

Fix warning/detection on tx1. I suppose it is an update to there compiler, as from memory, it working in the past.

* 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.