JuliaDiff / TaylorSeries.jl / 571

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Solve performance regresion (#103)

* Use `fixorder` again, to avoid the if's used in `getindex`

The use of those if's is at the heart of the problem reported in [#102].
The idea was to avoid fixorder by setting the coefficients that are
not defined to zero. This involves if's that killed performance.

Also, fixorder was corrected to return a copy of the coefficients to
avoid side effects.

`max_order` is not anylonger needed, so it is deleted.

* Fix tests and fateman.jl

* Tiny correction to fixorder

* Improvements on allocations

* Inline mul! and div! methods

* Use a modified power_by_squaring, and inline the (mutating) recursion functions

* Inline fixorder

* Inlining div!

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