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Remove ctools::time_reference constant and handle the time reference for MET either by using the time reference from the input observation, or by adding a hidden "mjdref" parameter. The following tools transparently use the time reference of the input observation: * ctselect (apply time reference of each input observation) * ctbin (apply time reference of first input observation) * csobsselect (apply time reference of each input observation) A "mjdref" parameter was added the following tools: * ctobssim * cslightcrv * cspull * csviscube * csobsdef