#3 Remove "Constant" class from SystemItem

[Norman Walsh]

Formerly RFE 76

With the addition of the Constant element, a Constant
class value on SystemItem is redundant.

Nov 98: FU-announce in 4.0 the removal of the class
value in 5.0.

16 Apr 2001: nwalsh can find no evidence that we did
the FU; do it for 6.0.

[Norman Walsh]

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My error. We did FU it.