Debug flag fix

Set local debug flag when setting layout constraints. Fixes problem where debugging wasn't working.

This is the change discussed here: http://markmail.org/search/?q=list%3Aorg.codehaus.griffon.user#query:list%3Aorg.codehaus.griffon.user+page:1+mid:wfxzp2yvrt2i2wz7+state:results