Fix layered navigation with negative prices.
Added minimal possible price to product.
Fix showing Gift Certificate total even when no GC used
Fix customer frontend invoice details do not show GC used information
Fix, when purchasing multiple certificates of same kind, only one PDF is sent
Fix, changed PDF settings fieldset name construction
Fix, typos in some files
Fix, OnestepObserver, was preventing non certificates to be used
Fix, sidebar cart block shows total 0 with giftcerts
Improvement, cleaned up some code in Observer.php
Fix, filtering by certificate ID is causing an error.
Fix, wrong setup resource string used in sql update file
Refactored email sending process
Fixed faulty logic for PDFs
Changed install file