Changing StaggeredProblem::checkConsistency to StaggeredProblem::checkProblemConsistency to enforce calling checkProblemConsistency methods on slave problems. This fixes problems with missing post setup initialization (done as a part of some classes in checkConsistency method).
Merge branch 'rel-2.2' of www.oofem.org:/data/git/oofem into rel-2.2
Upgrading to TinyXML-2.