[Seaside] Odd issue with SeasideForWebToolkit bundle (2.6b1.58.0)

[Martin J. Laubach]

> I tried re-loading SeasideForWebToolkit (2.6b1.58) from a vanilla VW
> 7.4nc image and get the following error after it gets installed and I
> try bringing up the counter (or any other) Seaside page :
> Message not understood: #addMetaContentType

  Same here. I meant to notify Boris but haven't gotten around to
it yet, so here is good enough :-) It seems that this latest bundle
is broken.

	mjl