Improvements to ajax auto-complete control

Imported from: http://groups.google.com/group/in-portal-dev/browse_thread/thread/e17bc57123e3fc10#

Ajax auto-complete control allows to suggest values based on what user is typing. Over years we have improved that control in a various ways, but never have merged that changes back to development branch. 

It's time to do this now (all in attached patch), here are the changes:

• show suggestion list only, when suggestions were found;
• styles fixed to make suggestion list positioned correctly and have proper width (as input it is attached to);
• support for tag auto-complete based on external tag table
• ability to cancel suggestion ajax query real time based on typed text or other criteria

tag_support_for_ajax_dropdown.patch

Related Tasks

INP-580 - Getting issue details... STATUS