-pop_front +iterator in xml parsing

acompare2/src/acompare.cpp

alib2data/src/XmlApi.cpp

alib2data/src/XmlApi.hpp

alib2data/src/alphabet/SymbolFromXMLParser.cpp

alib2data/src/alphabet/SymbolFromXMLParser.h

alib2data/src/automaton/AutomatonFromXMLParser.cpp

alib2data/src/automaton/AutomatonFromXMLParser.h

alib2data/src/container/ContainerFromXMLParser.cpp

alib2data/src/container/ContainerFromXMLParser.hpp

alib2data/src/exception/ExceptionFromXMLParser.cpp

alib2data/src/exception/ExceptionFromXMLParser.h

alib2data/src/factory/XmlDataFactory.hpp

alib2data/src/grammar/GrammarFromXMLParser.cpp

alib2data/src/grammar/GrammarFromXMLParser.h

alib2data/src/graph/GraphFromXMLParser.cpp

alib2data/src/graph/GraphFromXMLParser.h

alib2data/src/label/LabelFromXMLParser.cpp

alib2data/src/label/LabelFromXMLParser.h

alib2data/src/object/ObjectFromXMLParser.cpp

alib2data/src/object/ObjectFromXMLParser.h