Significant changes from the previous release:
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- Change how stock general ledger accounts are set.  Previously, you had to set it per location, per stock category.  Now GL accounts are set per stock item, with a default coming from the stock category.
- Add a build option exclusion matrix, so you can more easily handle build options that exclude other build options, without trying to tie your option tree in knots.
- Add warranty application.  Now you can handle warranty claims and accept returns.
- Change barcode system to use PEAR's Image_Barcode system, so projectERP can now generate EAN-13 and UPC-A barcodes.
