JuliaDiff / TaylorSeries.jl / 752

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RFC: Return n-th derivative of a Taylor1 as a Taylor1 (#137)

* Add derivative method
derivative(n,a) returns a Taylor1 variable; renamed existing derivative(n,a)
method as derivativeval

* Export derivativeval; add tests

* Fix & add derivative tests

* derivative(n,a) returns value; derivative(a,n) returns polynomial

* Improve performance with in-place operations with suggestions by @lbenet

* Fix docstrings

* Fix tests for julia v0.7-DEV

* Remove comment; add derivative test; add jacobian test for mixtures

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