Further CC updates

[wvlothuizen]

This PR provides:

• some updates to the OpenQL configuration for the CC
• speed improvements for the generation of RB sequences:
  • no longer reread hash tables from file on every call to two_qubit_clifford_group.py::get_clifford_id()
  • cache gate decompositions
  • compute pauli transfer matrices on demand, and cache them
  • example performance improvement (test changed to compute 2000 cliffords instead of normal 20):
    • original: 199.26s call pycqed/tests/test_cliffords.py::TestCliffordClassRBSeqs::test_interleaved_randomized_benchmarking_sequence_2Q
    • updated: 3.58s call pycqed/tests/test_cliffords.py::TestCliffordClassRBSeqs::test_interleaved_randomized_benchmarking_sequence_2Q

[codecov[bot]]

Codecov Report

Merging #680 (beaa2ff) into develop (e238290) will increase coverage by 0.53%. The diff coverage is 88.64%.

@@             Coverage Diff             @@
##           develop     #680      +/-   ##
===========================================
+ Coverage    35.76%   36.29%   +0.53%     
===========================================
  Files          297      297              
  Lines        64787    65042     +255     
===========================================
+ Hits         23168    23604     +436     
+ Misses       41619    41438     -181     

Impacted Files	Coverage Δ
.../measurement/openql_experiments/clifford_rb_oql.py	42.40% <0.00%> (+4.11%)	:arrow_up:
...measurement/openql_experiments/generate_CCL_cfg.py	0.00% <ø> (ø)
...ment/openql_experiments/generate_CC_cfg_modular.py	96.66% <ø> (ø)
...measurement/openql_experiments/single_qubit_oql.py	36.04% <ø> (+20.58%)	:arrow_up:
...surement/randomized_benchmarking/clifford_group.py	100.00% <ø> (ø)
...ized_benchmarking/generate_clifford_hash_tables.py	90.00% <ø> (ø)
pycqed/simulations/pauli_transfer_matrices.py	100.00% <ø> (ø)
...measurement/openql_experiments/cqasm/special_cq.py	64.28% <16.66%> (+39.28%)	:arrow_up:
...vers/meta_instrument/qubit_objects/HAL_Transmon.py	16.63% <33.33%> (-1.47%)	:arrow_down:
...d/measurement/openql_experiments/openql_helpers.py	60.51% <57.14%> (+6.30%)	:arrow_up:
... and 84 more

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