Implemented last-chance recovery that saves the current and spare page. (issue 97)

Tested OK on Windows when crashing Contour (issue 119)
Doesn't handle frozen states (when killed in task manager), I'll have to look further.


git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@628 416bcca6-2ee7-4201-b75f-2eb2f807beb1

init.h

@@ -28,3 +28,4 @@ void Initialiser_les_tables_de_multiplication(void);
 void Definition_des_modes_video(void);
 int ActiverLecteur(int);
 void Config_par_defaut(void);
+void Initialiser_sighandler(void);