Function nearMoc( moc, ra, dec, distanceDeg )

Description:
Indicates whether a given sky position either falls within, or is within a certain distance of the edge of, a given MOC (Multi-Order Coverage map). If the given moc value does not represent a MOC (for instance no file exists or the file/string is not in MOC format) a warning will be issued the first time it's referenced, and the result will be false.
Parameters:
moc (String)
a MOC identifier; a filename, a URL, a VizieR table name, or an ASCII MOC string
ra (floating point)
ICRS right ascension in degrees
dec (floating point)
ICRS declination in degrees
distanceDeg (floating point)
permitted distance from MOC boundary in degrees
Return Value (boolean):
true iff the given position is within distance degrees of the given MOC
Signature:
boolean nearMoc(String, double, double, double)