Eliminate naming conflict between form elements and attribute #7490
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This may or may not initially have been a problem, but browsers today allow the elements on a form to be accessed as
<form>.<element-name>. At the same time, they allow attributes of the form to be accessed as<form>.<attribute-name>. With the attribute and the button(s) both being namedaction, we're causing a conflict between the elements and the attributes. Renaming our "action" buttons to "__action" removes the clash and has the benefit that$formvalues starting with an underscore aren't persisted as form hidden values.