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[linear] remove self-written parallel linear solvers

Bernd Flemisch requested to merge feature/fs293-remove-solvers into master

In dumux/linear/boxlinearsolver.hh, there are several linear solver backends which use "self-written" infrastructure for parallel runs from several files in dumux/linear.

Deprecate those solvers and the infrastructure files due to the following reasons:

  • The parallelism is restricted to box.

  • The iteration counts deteriorate with growing process numbers.

  • The code is hard to maintain or to generalize.

  • We have the general / rather robust / mostly upstream-maintained AMGBackend.

Use the corresponding sequential solvers from seqsolverbackend.hh by default and in the serial tests.

This implements FS#293.

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