Syn.support.linkHrefJS is always false

Syn.support.linkHrefJS is always false, therefore the javascript in an anchor tags href attribute is executed twice. Once when the event is dispatched and then again because Syn manually evals the javascript.

The root cause seems to be that the feature test is never executed. The anchor tag synlink should be clicked on, but isn't in `mouse.js`:

    <a href='javascript:__synthTest()' id='synlink'></a>