Refactor `make_interp_spline` to use a single solve#30

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sixpearls wants to merge 12 commits intomasterfrom

single-solve-all-y-lines

Commits on Jun 11, 2019

minimal port of scipy make_interp_spline
sixpearls
committed

Commits on Jun 12, 2019

Commits on Jun 15, 2019

change ndim --> xdim, mdim --> ydim. will probably change that, but now it will be easier since no conflict with ndarray.ndim
sixpearls
committed

Commits on Jun 16, 2019

breaking up algorithm, separating out BCs, etc
sixpearls
committed

Commits on Jun 23, 2019