- Copied ComponentTransport folder
- Renamed ComponentTransport to RichardsComponentTransport

pointer to StaggeredCouplingTerm

 coupled processes.

minor changes according to Dima's comments.

 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