QDevil QDAC2: Leakage sweep

[jpsecher]

• set_virtual_voltage affects whole arrangement

[codecov-commenter]

Codecov Report

Merging #158 (d1382d4) into master (8bac704) will increase coverage by 0.58%.
The diff coverage is 97.36%.

@@            Coverage Diff             @@
##           master     #158      +/-   ##
==========================================
+ Coverage   18.80%   19.38%   +0.58%     
==========================================
  Files         123      124       +1     
  Lines       15581    15696     +115     
==========================================
+ Hits         2930     3043     +113     
- Misses      12651    12653       +2     

Impacted Files	Coverage Δ
qcodes_contrib_drivers/drivers/QDevil/QDAC2.py	96.44% <95.28%> (-0.04%)	⬇️
...rib_drivers/tests/QDevil/test_sim_qdac2_leakage.py	100.00% <100.00%> (ø)
...ivers/tests/QDevil/test_sim_qdac2_virtual_gates.py	100.00% <100.00%> (ø)

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[jpsecher]

After talking with Fabrizio, Torbjørn, Joost, etc at NBI, we decided to call output channels for "contacts" to avoid confusion of what an "arrangement" can contain.