Modified the crash backup script to add options "disable" and "resume".

However, this has not been implemented as it has been observed that
the use of itimer() has a restriction of one timer per process, which
interferes with the three or more uses of the timer within magic.  The
timer method will have to be changed to use the POSIX timer_create()
routine, before this will work properly.

utils/signals.c

@@ -26,8 +26,17 @@ static char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-8.0/
 #include <signal.h>
 #include <unistd.h>	/* for getpid() */
 #include <sys/time.h>
+#include <fcntl.h>
 
+#include "tcltk/tclmagic.h"
 #include "utils/main.h"
+#include "utils/magic.h"
+#include "utils/magsgtty.h"
+#include "textio/textio.h"
+#include "utils/geometry.h"
+#include "utils/signals.h"
+#include "windows/windows.h"
+#include "graphics/graphics.h"
 
 #ifndef	SIGEMT
 #define	SIGEMT	7	/* EMT instruction (SIGUNUSED) */
@@ -57,17 +66,6 @@ static char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-8.0/
 #endif
 #endif
 
-#include <fcntl.h>
-
-#include "utils/magic.h"
-#include "utils/magsgtty.h"
-#include "textio/textio.h"
-#include "utils/geometry.h"
-#include "utils/signals.h"
-#include "windows/windows.h"
-#include "graphics/graphics.h"
-
-
 #ifndef FASYNC
 #  define	FASYNC	00100	/* kludge for SUN2s */
 #endif