Decouple screenshot script from Xmd, Xmd session from Mwm

session/src/xmd-end-session

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if [ -z "$XMD_SESSION_PID" ]; then
+	echo "ERR session is not running (\$XMD_SESSION_PID not set)"
+	exit 1
+fi
+
+kill "$XMD_SESSION_PID"