Previously, it got passed the weights only needed for CPR.
Additionally those were passed with the parameter tree to the
update method and constructor.
Now the CPR constructor gets a function to use for recalculating
the weights and the property is not changed. Unfortunately this
means that the preconditioner creators of the factory get another
parameter.
It gives overhead in constructor when linear system is created. No overhead if reuse is used.
This commit 141903a26 cherry-picked, cleaned and made compilable with
recent changes
This replaces the makePreconditoner() function. The main advantage
is that it is extensible, making it easy to for example add new
preconditioners to the factory at runtime. It supports both parallel
and serial preconditioners.
