Remove unused variables in wpsc_product_advanced_forms().
DocBlock for wpsc_product_advanced_forms().
DocBlock and code standards in wpsc_product_personalization_forms() including using double quotes for HTML attributes.
Use wp_parse_args() instead of isset() is wpsc_product_personalization_forms().
Remove unneccesary hidden product personalization admin fields.
Fix product default value for 'engraved' (not 'engrave').
Prevent overwriting of personalization values by quick edit.
Streamine getting of external link data and adhere to code formatting standards in wpsc_product_external_link_forms().
Prevent overwriting of external link values by quick edit.
Merge pull request #1580 from benhuson/nonce_save_product

Nonce save product to prevent Quick Edit overridden saved values