core: remove autogroup global

Use the flag in the divelog structure, since this will be saved
in the dive log.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

desktop-widgets/mainwindow.h

@@ -189,6 +189,7 @@ private:
 	void hideProgressBar();
 	void writeSettings();
 	void refreshDisplay();
+	void updateAutogroup();
 	void showProfile();
 	int file_save();
 	int file_save_as();