Use AJAX to optimize load of advanced search

basically based on the GET / POST params we decide which blocks to show/hide. the blocks that are hidden actually dont get rendered and hence those form elements are not created, which will make the whole process much faster

which means the back end form creation and tpl need to be broken into much smaller chunks. We also need to generalize and add support for this in the framework so we can move all advanced options to a hidden section for the other pages

currently dojo does not support asynchronous loading, but we have all of the code in place for this when it happens. Might be a good contribution back to dojo, and i'll take a look at it as my js skills improve

lobo