A bit of LibFist hygiene, base64 favicon for test.html
Refactoring statusWrapper j0nx into Status class
Use type system to render ViewGraph only when necessary

If the ViewGraph is invalid or results in an expression with type other
than 'view', we don't need to evaluate it: we know it won't render
properly.
Draggable time selection filter on ViewLine

with other two soon to follow.
Draggable selection filters on ViewHistogram, ViewPlot