v1.6.0

Breaking Changes

• Quantum circuit RZZ definition corrected (angle changed by -1/2 to match qiskit).

Enhancements:

• add OpenQASM 2.0 parsing support: :meth:Circuit.from_openqasm2_file
• :class:Circuit: add RXX, RYY, CRX, CRY, CRZ, toffoli, fredkin, givens gates
• truncate TN pretty html reprentation to 100 tensors for performance
• add :meth:Tensor.sum_reduce and :meth:Tensor.vector_reduce
• :meth:contract_compressed, default to 'virtual-tree' gauge
• add :func:TN_rand_tree
• experimental.operatorbuilder: fix parallel and heisenberg builder
• make parametrized gate generation even more robost (ensure matching types so e.g. tensorflow can be used)

Bug fixes:

• fix gauge size check for some backends

Full Changelog: v1.5.1...v1.6.0