Fixed bug where user must submit coordinates inside quotation marks, and patched security flaw where string exec can be exploited.
Fixed bug where user must submit coordinates inside quotation marks, and patched security flaw where string exec can be exploited.

RobertABT/heightmap,RobertABT/heightmap,RobertABT/heightmap,RobertABT/heightmap,RobertABT/heightmap