Improvements and additions to make smoother plots#4

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CFretter wants to merge 4 commits intomitxela:masterfrom

CFretter:master

Commits on Jun 8, 2020

added blurring as a preprocessing step to makechanges smoother
CFretter
committed

Commits on Jun 9, 2020

port AM/FM switch to squiggLeftRight
CFretter
committed

Commits on Jun 10, 2020