Refactoring

[ChrisRackauckas]

Some of our code could use a pretty major refector. For example, we have a bunch of branches for all of the different linear operator choices, and this could be made much simpler.

https://github.com/SciML/Sundials.jl/blob/master/src/common_interface/solve.jl#L164-L231

It doesn't really much knowledge of the library itself, and would be a good way to learn.

[ViralBShah]

Is there a good first issue sort of label in the SciML ecosystem?

[ChrisRackauckas]

There was, I wonder if Github removed that?

[jd-lara]

I can take a swing at this. I will be able to spend time over the weekend. I also want to enable passing solver parameters for the linear solvers. I am thinking about interfacing them in a way consistent with DiffEq

[jd-lara]

is this related to #242 ?