Add option cpa.composite.splitMultiEdges (default: false).
This allows to call strengthen for each edge inside a MultiEdge,
which might be necessary to share enough information between CPAs.
This option does not work with backwards analyses.
MultiEdges are going to be removed in the future anyway.


git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14957 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c