beremiz

Runtime: add GetVersions() call to PLCObject, use it in web settings and expose it in WAMP and Pyro.

Note: WAMP changes are untested
<?xml version='1.0' encoding='utf-8'?>
<ModbusRequest xmlns:xsd="http://www.w3.org/2001/XMLSchema" Function="04 - Read Input Registers" SlaveID="0" Start_Address="0"/>