add directory to tile

[rmarabini]

when a file as "particles.sqlite3" is displayed the name of the file appears in the window title. If many files called "particles.sqlite" (placed in different directories) are displayed sometimes is difficult to know the origin of each window. Therefore, it will be useful to add the last two subdirectories in the window title. That is, instead of showing "particles.sqlite" show "0002345XXX/extra/particles.sqlite"