Release 0.5.0

Changes from 0.4.1 to 0.5.0

• New pack_tensor, unpack_tensor, save_tensor and load_tensor functions for serializing/deserializing PyTorch and TensorFlow tensor objects. They also understand NumPy arrays, so these are the new recommended ones for serialization.

• pack_array2 do not modify the value of a possible cparams parameter anymore.

• The pack_array2 / save_array have changed the serialization format to follow the new standard introduced in pack_tensor. In the future pack_array2 / save_array will probably be deprecated, so please change to pack_tensor / save_tensor as soon as you can.

• The new 'standard' for serialization relies on using the __pack_tensor__ attribute as a vlmeta (variable length) metalayer.