m-editor: open a new file from the directory of the last active tab * file-editor-tab.cc, file-editor-tab.h: new get_file_name method & open_file with a directory * file-editor.cc: request_open_file with the path to the last active file

gnulib = [git]git://git.sv.gnu.org/gnulib
libgui/qterminal = [git]https://code.google.com/p/qterminal/