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                                            psv4

Use Sherman-Morrison formula with implicit solvers

Mentioned in #265 , the Jacobian inverse is explicitly calculated for the FIRK and DIRK solvers. To avoid this expensive calculation, the [Sherman-Morrison](https://en.wikipedia.org/wiki/Broyden%27s_method) formula can be used to calculate and...

Sherman Morrison Method for Implicit Solvers

Closes #267 and Closes #214 . Replaces the costly Jacobian inverse calculation for implicit solvers with the good [Sherman-Morrison](https://en.wikipedia.org/wiki/Broyden%27s_method) method. Additionally, reorders the tableau for GL4 to be closer to...