Inconsistent column description for magnetic longitude/magnetic local time for SuperMag indices_all dataset

In the info/indices_all.json file for, the 4th column has the entry:

	{"name": "SMLmlt", "type": "double", "units": "degrees", "fill": "999999.0", "description": "SML magnetic longitude"},

However, SMLmlt is a magnetic local time, not a magnetic longitude. This difference is clearly seen when the HAPI verifier is run on the indices_all dataset.
