introduced option to delete subgraphs after merge in predicated analysis, needed for later transformation of ARG into valid C program, but typically option is disabled they are kept

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14341 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c
refactoring, kept unused code to later easily integrate if needed configuration option for predicated analysis without lazy refinement

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14342 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c
formatting

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14343 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c
valid vars state implements interface Graphable

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14344 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c
merged with trunk until r14344

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/branches/runtime_verification@14345 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c