SVGHMI: added a watchdog. To ensure that the whole chain is checked, watchdog use a periodic echo of a hearteat variable. JS client code systematically register /HEARTBEAT at 1s update freq, and reacts on updates of /HEARTBEAT by systematically incrementing it. C code catch /HEARTBEAT update and feeds python-implemented watchdog. For now, watchdog does nothing when tiggered

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These classes are intended for use server-side.

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e.g. in a django view.py :

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    from pyjs.jsonrpc.django import JSONService, jsonremote

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    jsonservice = JSONRPCService()

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    @jsonremote(jsonservice)

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    def test(request, echo_param):

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         return "echoing the param back: %s" % echo_param

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