Bertini input#3

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GrantInnerst wants to merge 7 commits intodkahle:masterfrom

GrantInnerst:bertini_input

Commits on Sep 26, 2019

add sharpening module
GrantInnerst
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Commits on Oct 9, 2019

making changes to facilitate the creation of user-defined homotopy function.
GrantInnerst
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Commits on Oct 18, 2019

Merge branch 'master' of https://github.com/dkahle/bertini into bertini_input
GrantInnerst
committed