Add missing member declaration
Remove unused function
SessionList API to search for specific sessions/results
Enhanced Search Functionality

- encapsulated search input handling in SearchView
- use prefix characters to control search topic (result ID, session ID,
site name, sector name)
- auto-hiding help panel for search prefixes
Directory cleanup: move non-Models out of /models
Clear session lines when search came up empty
Improve definition of FileLoader API

- move tracking of queued files into FileLoader
- callback for "all files loaded completely" state
Fix session search for Accuracy Test data

- since 8159e12 the "id" of Session models is mangled with the fileId
- introduced SessionList.findSession() to find sessions by the
"sessionId" attribute of the model