[pLog-svn] LT-1.3-ajax branch demo

[Oscar Renalias]

After hacking away the last few days working on some new ideas for  
1.3 (most of them based around ajax to "spice up" the admin interface  
a little), I've set up a test installation at http:// 
devel.lifetype.net/lifetype-1.3-ajax/admin.php (LT user=user / LT  
password=user - HTTP user=devel / HTTP password=d3v3l)

Basically, this is what I've been toying with:

- Added a performAjax() to many action classes, so that they generate  
content ready to be consumed by a json/javascript client. Just append  
"&output=json" to a URL like "admin.php?op=addArticleCategory" and  
see the results.

- Based on the work above, validation of forms via XmlHttpRequest has  
been implemented, where field errors are reported in the background  
and dynamically displayed in the form wherever necessary.

- All the "New XXX" options ("New Link", "New Category", etc) options  
have been moved, so that for example "New Link" is now an option that  
appears only in the "Links" page and so on. Doing so has allowed the  
"Manage" menu to go down to 7 options which now all fit in one single  
row of tabs. I'd like to reduce the number of options available when  
users click "Manage", do we really need 12 of them in there?

- In addition to the idea above, all the "New XXX" and "Edit XXX"  
screens are modal dialogues that appear as some sort of pop-up  
overlaid on top of the current screen. The idea is that users don't  
lose focus of where they are, so if they're browsing the list of  
categories, I think it's safe to assume that they should stay there  
if they want to edit or add a new category.

- Better usage of the screen space in the "Resources" page, now files  
appear in some sort of dynamic table that allows to show a lot more  
of them.

You don't need to install this branch in your computers, I'm making  
it easy to test this in our server and send us your feedback :-) We'd  
like to know if we're going the right way.

Oscar