Moved check for existing overlay file to INSTALL...

Corrected grep argument for UNINSTALL
Added pull-up for GPIO 16 (ShutdownMonitor)

setup

@@ -90,14 +90,16 @@ fi
 if [ $scriptAction == 'INSTALL' ] ; then
 	updateActiveFile "$gpioListFile"    
 	updateActiveFile "$rulesFile"
-    updateActiveFile "$overlayFile"
+	# install overlay only if it doesn't exist
+    [ -f "$overlayFile" ] || updateActiveFile "$overlayFile"
 
     if [ $(grep -c "CAN+RS485 overlay" "$configFile") == 0 ]; then
         logMessage "activating CAN+RS485 DT overlay"
         echo "#### begin CAN+RS485 overlay" >> "$configFile"
         echo "dtparam=spi=on" >> "$configFile"
 		echo "dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25,,spimaxfrequency=1000000" >> "$configFile"
 		echo "dtoverlay=sc16is752-spi1,int_pin=24" >> "$configFile"
+		echo "gpio=16=ip,pu" >> "$configFile"
         echo "#### end CAN+RS485 overlay" >> "$configFile"
         filesUpdated=true
     fi
@@ -107,13 +109,12 @@ fi
 # if an install step failed package needs to be removed
 if [ $scriptAction == 'UNINSTALL' ] ; then
     restoreActiveFile "$gpioListFile"
-	restoreActiveFile "$rulesFile"
-	# install overlay only if it doesn't exist
-	[ -f "$overlayFile" ] || restoreActiveFile "$overlayFile"
+	restoreActiveFile "$rulesFile"	
+	restoreActiveFile "$overlayFile"
 
     # remove mods from configFile - do not use restore in case other mods were made manually
     if [ -f "$configFile" ]; then
-        if [ $(grep -c "#### change all digital inputs to pull ups" "$configFile") != 0 ]; then
+        if [ $(grep -c "#### begin CAN+RS485 overlay" "$configFile") != 0 ]; then
             sed -i -e '/#### begin CAN+RS485 overlay/,/#### end CAN+RS485 overlay/d' "$configFile"
             filesUpdated=true
         fi