Add ballfun examples - #56

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NBoulle wants to merge 4 commits into

add-ballfun-examples

Commits on Aug 21, 2018

Add Helmholtz decomposition example.
ajt60gaibb
committed

Commits on May 7, 2019

Update ballfun examples
Nicolas Boulle
committed

Commits on May 13, 2019

Update date
Nicolas Boulle
committed

Commits on May 14, 2019

Merge sphere and ball examples
Nicolas Boulle
committed