remove deprecated features

alib2algo/src/regexp/convert/ToAutomatonDerivation.h

alib2data/src/alphabet/LabeledSymbol.cpp

alib2data/src/alphabet/LabeledSymbol.h

alib2data/src/alphabet/Symbol.cpp

alib2data/src/alphabet/Symbol.h

alib2data/src/alphabet/xml/LabeledSymbol.cpp

alib2data/src/alphabet/xml/LabeledSymbol.h

alib2data/src/label/Label.cpp

alib2data/src/label/Label.h

alib2data/src/label/PrimitiveLabel.cpp

alib2data/src/label/PrimitiveLabel.h

alib2data/src/label/xml/PrimitiveLabel.cpp

alib2data/src/label/xml/PrimitiveLabel.h

alib2data/src/regexp/RegExp.h

alib2data/src/regexp/formal/FormalRegExp.h

alib2data/src/regexp/unbounded/UnboundedRegExp.h

alib2data/test-src/alphabet/SymbolTest.cpp

alib2data/test-src/alphabet/SymbolTest.h

alib2data/test-src/automaton/AutomatonTest.cpp

alib2data/test-src/label/LabelTest.cpp