Override files / add calibration script for the first run

os-brainux/override/etc/X11/Xsession.d/96calibrate

@@ -0,0 +1,4 @@
+if [ ! -e /etc/X11/xorg.conf.d/99-calibrator.conf ]; then
+	xinput_calibrator --output-filename /etc/X11/xorg.conf.d/99-calibrator.conf
+fi
+

os-brainux/override/etc/X11/xorg.conf

@@ -0,0 +1,8 @@
+Section "Device"
+        Identifier "device"
+        Driver     "fbdev"
+EndSection
+Section "Screen"
+        Identifier "screen"
+        Device     "device"
+EndSection