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Reuse amg hierarchy correctly

Markus Blatt requested to merge reuse-amg-hierarchy-correctly into master

At least some AMG backends allow to set set a reuse flag which results in not contruction the AMG including hierarhy from scratch. We set this flag to true whenever there was no need to reassemble and otherwise to false.

Note that this implies that setting the parameter with the backend's constructor has no effect anymore. But that might actually turn out to be good as previously setting this to true in a nonlinear PDE meant using a wrong preconditioner throught all steps of the newton but the first one.

We should use this approach ILU and DG backends, too.

This fixes #72 (closed)

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