Make the prefix filter operator be case insensitive by default
Update the popup manager to allow popup state to be forced, rather than toggled

We'll be needing this shortly
Update link widget to use current tiddler as default target
Allow class to be specified for list widget frame element
Update fieldmangler widget to be able to add and remove tags
Update linkcatcher to optionally trigger a different event
Update the transclude widget to update parameters for remove tag message
Update edit widget to trigger a popup when focussed

This will allow us to do autocompletion
Add a better tags editor

Now tags can be individually removed, and added with autocomplete