Updated event code to have automatic updates to the map location when entering an...

Updated event code to have automatic updates to the map location when entering an address for a new event until one of the following happen.

* The event is submitted (will not auto update when editing later.
* The user clicks the "Map Location Using Above Address" button
* The user drags the map pointer to a new location.
* "Update pointer" button is clicked to use specified lat/lon values.

Also added more instructions on how to use the map below the "Update pointer" button.

Tested and committed to code as HotFix