+variables bar in prefixRankedBar notat.of pattern

alib2data/src/alphabet/SymbolFromXMLParser.cpp

alib2data/src/tree/TreeFromXMLParser.cpp

alib2data/src/tree/TreeFromXMLParser.h

alib2data/src/tree/TreeToXMLComposer.cpp

alib2data/src/tree/TreeToXMLComposer.h

alib2data/src/tree/ranked/PrefixRankedBarPattern.cpp

alib2data/src/tree/ranked/PrefixRankedBarPattern.h

alib2data/test-src/tree/PatternTest.cpp

alib2data/test-src/tree/TreeTest.cpp