Replace SymEngine.jl by ModelingToolkit.jl#38

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dkarrasch wants to merge 4 commits intomasterfrom

Commits on Apr 26, 2020

now using ModelingToolkit for Differentiation

adediego
authored and
dkarrasch
committed
fixed error with sign function

adediego
authored and
dkarrasch
committed
clean up parts of the code responsible for SymEngine

adediego
authored and
dkarrasch
committed
added ModelingToolkit as a dependency

adediego
authored and
dkarrasch
committed