Fix for issue #3: Fix the dropdown editor
Fix for issue #4: Remove the "Activate/Deactivate Commercial Margin"
Fix for issue #5: Remove the wholesale pricing fields
Fix for issue #7: Add support for products priced by attributes; Fix for issue # 9: Remove the popup edit feature; Implemented zencart_auto_installer
fix for broken functionality: Allows you to globally increase or decrease the price for a range of products.
Friendlier messages
Merge pull request #11 from bislewl/master

Fixes for the following issues:
#3, #4, #5, #7

Other fixes needed