GETPROPLIST Return names of list properties

    PL=GETPROPLIST(LAB)

 INPUT
    LAB    SDLAB object

 OUTPUT
    PL     cell array with propery names

 DESCRIPTION
 GETPROPLIST returns a cell array with names of all properties in the
 LAB object.

 SEE ALSO
 SETPROP, GETPROP, ISPROP, RMPROP