for flexibility in coupling.

 VectorMatrixAssemble::assembleWithJacobian

Clang format run on near-the-header lines.

Happy New Year

pointer to StaggeredCouplingTerm

 for the staggered scheme.

coupled terms.

[PCS] set the shape function order from config assuming all the primary variables use the same order

* context: class -> struct
* global vector from named fct: result_cache -> result
* cached 2ndary var: fixed member name