Feature: cprw solver: add overlap connections of distributed wells to the pressure matrix

[michal-toth]

The pressure system of the cprw solver does treats a distributed well as a collection of smaller wells - each rank has a smaller well. Just using a correct IDs for the well equations allowed us to get the equations to the correct row of the matrix on the coarsest level but the performance got worse. We hope that adding the overlap connections will improve the performance.

To treat a distributed well as one entity in the pressure system, we:

1. Match IDs of well equations in the coarse system
2. Extend the pattern of the matrix to accommodate the overlap
3. Communicate the overlap entries from other ranks (this the the most difficult part)
4. Change the diagonal term - consider weights of all cells, not just the local perforations

[michal-toth]

It needs some refactoring and rebasing to the current master. However, it will have to wait for the next year.

[michal-toth]

jenkins build this serial please

[michal-toth]

jenkins build this serial please

[akva2]

cmake -DBUILD_FLOW_FLOAT_VARIANTS=1 to reproduce failure.

[michal-toth]

jenkins build this serial please