Fixes #0000871: 3rd refactoring of Shipping Quote Engines related to USPS
1. Bug #0000695: Remove endless "!" inside admin templates
Bug #0000857: Customized form blocks were not using "form_row" design resulting fatal error
Bug #0000787: Design for block with error message
Fixes #0000789: Several warnings on order edit shipping tab, when shipping quote engines are used
Merge of "w/in-commerce/releases/5.0.2@13081" to "w/in-commerce/branches/5.1.x@12674".
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