Comply with semantics described in TEP, use HilTimerMilli as base for LocalTime in...

Comply with semantics described in TEP, use HilTimerMilli as base for LocalTime in milli seconds.

TestFtsp works, however FTSP relies on the assumption that
message_t.data = call Send.getPayload (just like BaseStation)
but this is not true for RedMac/SpeckMacD on an eyesIFX node.

After suitable modification of TimeSyncP (replace
TimeSyncMsg* msg = (TimeSyncMsg*)(processedMsg->data);
with
TimeSyncMsg* msg = (TimeSyncMsg*)(call Send.getPayload(processedMsg, sizeof(TimeSyncMsg)));
it works.