added some basic array support to ValueAnalysis; some heuristics for interpolation, based on information added to variable classification, all done to tackle RERS 2014 competition

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/branches/rers2014@13442 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c