Enharmonical variants works in single mode, small fixes

TODO

src/CMakeLists.txt

src/charts/tanalysdialog.cpp

src/libs/core/score/tscoreclef.cpp

src/libs/core/score/tsimplescore.cpp

src/main.cpp

src/mainwindow.cpp

src/mainwindow.h

src/notename/tnotename.cpp

src/notename/tnotename.h

src/score/tmainscore.cpp

src/score/tmultiscore.cpp

src/tmainview.cpp