Allow use of bitvector formulas in SAT checks of ConstraintsCPA.

Usage of bitvector formulas can be turned on by changing option 'cpa.constraints.formulaNumberHandling'.
Correct bit size is currently used depending on expression type, but it is assumed that all types are signed.



git-svn-id: https://svn.sosy-lab.org/software/cpachecker/branches/symbolic@15174 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c