USPS Shipping Insurance 1.1

Changes since v1.0
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* Corrected the colspan to "3" instead of "4" in the second half of checkout_payment.php
* Corrected the table alignment issues in checkout_payment.php
* Added BEGIN and END comments to the stylesheet
* Added the missing Tax Class database entry and corresponding code edits
* Added update instructions

[well, I did forget a few things :) ]

Scott (olsonsp4c)

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