[PATCH] fix panel sizing

[Chani]

review board is down for easter, so we're back to the old-fashioned method.

this fixes the panel sizing perfectly for me; I don't think it should cause 
any trouble with multiple screens, but please test anyways.

in this patch I had to set default values in the constructor to prevent 
problems when there is no config file; what I don't understand is why I had 
to set *all* the default constraints and not just some. or rather, why it 
worked in the first place. if screen and location are set but not formfactor, 
then there's some weird insanity where the panel's applets are set up before 
the panel has a chance to run constraintsUpdated, and the applets get 
confused about where to put themselves. but if screen and location are left 
alone (resulting in an incorrect default panel size) then the applets are 
fine.

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