REFACTOR: test for membership should be "not in".
Fix: typo
DOC: document ahkab.results.
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
MINOR: update test plots
Update to new AC solution parameters
Remove hack for now closed bug in sympy.
Merge branch 'master' of https://github.com/ahkab/ahkab into tests