[Zope] Yihaw on 2.2.1b1, boolean properties

[Wolfgang Strobl]

I just tried installing a freshly downloaded copy of 
YihawDirectory.zexp into a relatively new 2.2.1b1, but in vain.

<snip>
Error Type: Permission mapping error
Error Value: Attempted to map a permission to a permission, 
Add Yihaw Objects, that is not valid. This should never happen. (Waaa). 
<snip>

I'm still looking for a way to get rid of the "checked" state of
some boolean properties, i.e. "toplevel" or "highlight" and such. 
Once it is set, it sticks.



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