RMPROP  Remove property from data set

     B=RMPROP(A,PROP)

 INPUT
    A      SDDATA object
    PROP   String name of a property

 OUTPUT
    B      SDDATA object

 DESCRIPTION
 RMPROP removes a property from a data set.
 Some properties cannot be removed:
   - 'data' property (data matrix)
   - sample property which is used as labels (by default 'class' or
     set using SETLAB)
   - feature property used as feature labels ('featname' by default
     or set using SETFEATLAB)

 SEE ALSO
 SETPROP, SETLAB, SETFEATLAB, GETPROPLIST