Gnote 3.9.3 Allows Users to Protect Notes

Gnote 3.9.3 lets users protect notes by implementing the ReadOnly add-on, it brings the Special Notes notebook add-on, and the BOOST_FOREACH and boost::lexical_cast dependencies are not used if C++11 is supported. Among the bugs fixes we can mention that a new note windows will not be opened if it’s already open, lock-up is now avoided, the notes list result is now updated when getting back, and missing Active Notes notebook icon was added.