Christophe Guillon authored 9 months ago and Maxence Naud committed 9 months ago

Add python enum values for all defined dtypes as per the
table of dtype names (lower case of the dtype names).
Add __str__() binding such that str(tensor.dtype()) return
bare enumeration names, suitable for comparison with numpy
dtype names.

- Fix datatype call
- Change 'DataType' to 'dtype' for Python interface

- [Add] Attributes: __str__(), __repr__() and dict() methods
- [Add] GraphView: __repr__(), __len__() methods
- [Add] Node: __repr__() method
- [Add] Operator: __repr__() method and attr property
- improve Tensor __str__ method if it is empty
- change DataType to lower case for python