Jumper (corrected)

Some small fixes + testing on the Jumper type generators

Jumper

Added two new $Q_ \Delta$ generators :

• Jumper : diagonal coefficients allowing 2 order jump per SDC sweeps
• FlexJumper : mix between the Jumper and MIN-SR-FLEX generators, allowing order jumps while still maintaining high numerical stability

🎓 Inspired from the work of Joscha Fregin and Eugen Bronasco

Docydoc

Main rework of the documentation, fixing some aspects on readthedocs

Lagrange

Added derivation matrix generation for the LagrangeApproximation class (since it's a bit free). Second order still need the correct formula ...

Number 13

• addition of fourth order stiffly accurate RKM with #13 thanks to @brownbaerchen
• addition of LDU based QDeltaGenerator with 1107c60

Maze echo

Addition of a new RK method with #12 thanks to @brownbaerchen

November drop

Some minor addition, in particular :

• new RK scheme and some fix with #10 and #11 thanks to @brownbaerchen
• addition of polynomial regression
• some typo fixes and tutorial improvements

Yet another RK scheme

Addition of a new IMEX RK scheme, thanks to @brownbaerchen (#9)

Node-to-node formalism

• definitive structure and test for the node-to-node (N2N) formulation
• N2N form can be used for $Q$ and $Q_\Delta$ coefficients similarly
• started tutorials

Reaching maturity

• finalized a proper design for $Q_\Delta$ generators, with some additional safety checks
• minor improvement on docs