GETNAMES  Get name for each label entry

     N=GETNAMES(LAB)

 INPUT
    LAB    SDLAB object

 OUTPUT
    N      Character array with category names

 DESCRIPTION
 GETNAMES returns character array with category name for each entry.
 A useful shorthand for GETNAMES is unary plus operator +LAB.

 SEE ALSO
 GETINDICES, GETLIST