Error message when layer name starting with number in MapGuide

[sparkliu]

1. Create a layer with name "0"
2. Add it to map
3. Open Fusion with that map and try to select a feature on that layer.

You'll find an error message "Unable to get value of the property 'getNumElements': object is null or undefined"

When Fusion try to store selection set in session, it uses layer name as property name, but PHP doesn't allow property name beginning with number. That's the reason.

[sparkliu]

Fix patch