Color input element

Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/84fa0b7085e7b3a8#

I propose add to form_blocks.tpl of administrative console element for
color input field (color picker), based on scripts from the page
http://www.daltonlp.com/view/174 . I've already made such block
locally - if necessary, I can make the patch.