Qibo

Pre-release for testing.

Pre-release for testing.
- adiabatic evolution algorithms
- code optimization and acceleration
- advanced tutorials and examples
- linux wheels are compiled with CUDA 10.1 and manylinux2010 support.

Pre-release for testing.
- multi-gpu support
- single package with cuda10.2 and cpu-only support
- new hamiltonian overloading operators
- decomposition of multi-controlled X gates
- options to set default simulation precision, backend and device
- enhanced interface for gate matrices
- pylint errors fixed
- fixed checks for custom operators

Linux wheels are compiled with CUDA 10.2 support.

Pre-release for internal testing.