Ubercart

Hi,
Thanks to the author for this contribution because the long default field lengths were bugging me greatly and I didn't know how to fix it.

Anyway, I just added an option to turn on and off the help text ("The Field Must be numeric" etc.) in the product page. Since I am a novice at programming, I'm not sure whether it is using good syntax, though it seems to be working fine. The modifications were pretty trivial. I put comments to where I made the changes.