add point source with far-field directivity of circular piston#156

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fietew wants to merge 7 commits intosfstoolbox:masterfrom

fietew:circular_piston

Commits on Nov 21, 2019

add point source with far-field directivity of circular piston
Fiete Winter
committed

Commits on Nov 22, 2019

fix wrong distance attenuation
Fiete Winter
committed
fix wrong syntax
Fiete Winter
committed

Commits on Dec 19, 2019

fix issues with codestyle
Fiete Winter
committed
fix missing blank line in docstring
Fiete Winter
committed

Commits on Dec 20, 2019

fix docstring in jinc function
Fiete Winter
committed
explain usage of cosine
Fiete Winter
committed