reinvent to_string and from_string

aconvert2/src/DotConverter.cpp

aconvert2/src/TikZConverter.cpp

alib2common/src/XmlApi.hpp

alib2data/src/graph/common/GraphFromXMLParser.cpp

alib2data/src/graph/common/GraphToXMLComposer.h

alib2data/src/label/HexavigesimalLabel.cpp

alib2data/src/primitive/Integer.cpp

alib2data/src/primitive/Unsigned.cpp

...rc/provisioner/MeasurementProvisionerConfigurationXml.cpp

...repp/src/provisioner/MeasurementProvisionerResultsXml.cpp

alib2std/src/extensions/string.cpp

alib2std/src/extensions/string.hpp

alib2std/src/string

alib2std/test-src/extensions/StringTest.cpp

alib2std/test-src/extensions/StringTest.h

alib2str/src/graph/GraphFromStringParser.cpp

alib2str/src/primitive/PrimitiveFromStringParser.cpp

alib2str/src/tree/TreeFromStringParser.cpp

alib2str/src/tree/TreeToStringComposer.cpp