TSPHP-625 excl. antlr from static analysis, incl. in code coverage - improved build-common.xml
Moved the ErrorReporting walkers into namespace antlrmod in order that they are considered in the static code analysis.
Made a few cleanups according to pmd and findbugs report.
Tighten cpd down to 50 tokens. I really do not want to have code duplication in this project