further deprecation of unused functionality

[wvlothuizen]

Please use the following template for a pull request.

Fixes #issuenumber.

Changes proposed in this pull request:

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In order for the pull request to be merged, the following conditions must be met:

• test suite (Github actions) passes
• all reasonable issues raised by codacy must be resolved
• a positive review is required

Whenever possible the pull request should

• follow the PEP8 style guide
• have tests for the code
• be well documented and contain comments

Tests are not mandatory as this is generally hard to make for instruments that interact with hardware.

[codecov-commenter]

Codecov Report

Merging #646 (b4cf532) into develop (5338c51) will increase coverage by 2.75%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #646      +/-   ##
===========================================
+ Coverage    32.72%   35.48%   +2.75%     
===========================================
  Files          316      288      -28     
  Lines        69211    60875    -8336     
===========================================
- Hits         22651    21599    -1052     
+ Misses       46560    39276    -7284     

Impacted Files	Coverage Δ
...ycqed/instrument_drivers/meta_instrument/Magnet.py	0.00% <ø> (ø)
...vers/meta_instrument/qubit_objects/CCL_Transmon.py	10.87% <ø> (-0.07%)	:arrow_down:
pycqed/measurement/calibration_toolbox.py	12.87% <ø> (+0.46%)	:arrow_up:
pycqed/measurement/composite_detector_functions.py	9.31% <ø> (-0.40%)	:arrow_down:
pycqed/measurement/cz_cost_functions.py	10.00% <ø> (-13.73%)	:arrow_down:
pycqed/measurement/detector_functions.py	32.50% <ø> (+5.89%)	:arrow_up:
pycqed/measurement/optimization.py	86.99% <ø> (-0.51%)	:arrow_down:
pycqed/measurement/sweep_functions.py	23.04% <ø> (+0.06%)	:arrow_up:
pycqed/tests/dev_qubit_objs/test_qubit_objects.py	18.83% <ø> (-1.05%)	:arrow_down:
pycqed/tests/openql/test_generate_CCL_cfg.py	100.00% <ø> (ø)
... and 6 more

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[MiguelSMoreira]

@wvlothuizen shall we incorporate the deprecations proposed in this PR in the develop branch? if so, could we please pull develop again onto feature/cleanup and solve any remaining conflicts before proceeding? I will be happy to quickly review the changes after that is done!