Carry static context information into subprocesses

[s0undt3ch]

Fixes #1079

[s0undt3ch]

Please provide direction if this is the wrong one.

[codecov-io]

Codecov Report

Merging #1089 (e92571b) into master (7ff93a9) will decrease coverage by 0.03%. The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master    #1089      +/-   ##
==========================================
- Coverage   91.28%   91.25%   -0.04%     
==========================================
  Files          90       90              
  Lines       13358    13360       +2     
  Branches     1493     1493              
==========================================
- Hits        12194    12191       -3     
- Misses        953      957       +4     
- Partials      211      212       +1     

Impacted Files	Coverage Δ
coverage/multiproc.py	67.69% <66.66%> (-3.74%)	:arrow_down:
coverage/control.py	90.62% <100.00%> (-0.53%)	:arrow_down:

[ProsperousHeart]

Is this still valid?