Modifies quit to handle restarts and adds SIGHUP and SIGTERM handlers.

Modified quit() to restart if it receives arg .i = 1
MOD+CTRL+SHIFT+Q was added to confid.def.h to do just that.

Signal handlers were handled for SIGHUP and SIGTERM.
If dwm receives these signals it calls quit() with
arg .i = to 1 or 0, respectively.

To restart dwm:
MOD+CTRL+SHIFT+Q
or
kill -HUP dwmpid

To quit dwm cleanly:
MOD+SHIFT+Q
or
kill -TERM dwmpid

dwm.1

@@ -142,6 +142,9 @@ Add/remove all windows with nth tag to/from the view.
 .TP
 .B Mod1\-Shift\-q
 Quit dwm.
+.TP
+.B Mod1\-Control\-Shift\-q
+Restart dwm.
 .SS Mouse commands
 .TP
 .B Mod1\-Button1
@@ -155,6 +158,13 @@ Resize focused window while dragging. Tiled windows will be toggled to the float
 .SH CUSTOMIZATION
 dwm is customized by creating a custom config.h and (re)compiling the source
 code. This keeps it fast, secure and simple.
+.SH SIGNALS
+.TP
+.B SIGHUP - 1
+Restart the dwm process.
+.TP
+.B SIGTERM - 15
+Cleanly terminate the dwm process.
 .SH SEE ALSO
 .BR dmenu (1),
 .BR st (1)