[ic] Method to change pricing based on size selected

[Mike Heins]

Quoting Josh Wex (josh@quixer.com):
> After many hours, I have discovered a way to do pricing based on size.  The
> default interchange demo had a malfunctioning quantity pricing as well, so
> the changes also reflect that being fixed.  I use the default database, and
> use excel (I'm a newbie!) to modify the products.txt and pricing.txt files to
> add items.  

The construct demo is not set up to do pricing changes by size, that is
why. The only demo that has it installed by default is "simple", which
is available via CVS.

Also, quantity pricing should indeed work on construct, but only when the
user logged in is defined as a dealer.

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