Add shebang and change variable name in runflaskdav script.

runflaskdav

-PATH="/"
+#! /bin/bash
+
+WEBDAV_PATH="/"
 if ! [[ -z "$1" ]] ; then
-    PATH="$1"
+    WEBDAV_PATH="$1"
 fi
 
 if ! [ -r "ssl.key" -a -r "ssl.cert" ] ; then
   /usr/bin/openssl req -nodes -newkey rsa -days 365 -keyout "ssl.key" -x509 -out "ssl.cert"
 fi
 
-/usr/local/bin/python flaskdav.py --cert ssl.cert --key ssl.key --path "${PATH}"
+/usr/local/bin/python flaskdav.py --cert ssl.cert --key ssl.key --path "${WEBDAV_PATH}"