WIP of bit-tag implementation, compiles, does not work yet

libcorpus2/lexeme.cpp

libcorpus2/tag.cpp

libcorpus2/tag.h

libcorpus2/tagset.cpp

libcorpus2/tagset.h

libcorpus2/tagsetparser.cpp

libcorpus2/token.cpp

libcorpus2/token.h

libcorpus2/util/symboldictionary.h

tagset-tool/main.cpp

tests/basic.cpp