Annotations below first layer are fetched on request: https://github.com/charmeproject/charme_plugin/issues/78
Motivations no longer disappear from dropdown: https://github.com/charmeproject/charme_plugin/issues/75
Auto-capitalisation of targets restored (data providers don't need to capitalise target types in their anchor tags).
Targets in target lists are links.
Fast back-and-forth browsing doesn't confuse searchannotations listeners.
Selected target list can be updated without minimising plugin window.
'Flag annotation' code ready for testing.
Other minor fixes and comments.