Split sorting by date-state into helper
Add CountCategories helper
Document functions in vtd.vim
Add vtd#SystemModificationTime()
Add vtd#view#ObjectWhoseKeymapIs(keymap)
Add vtd#statusline#{Late,Due}()
Use new 'AllActions' from libvtd

This speeds up the [A] view by a factor of more than 2.
Pad statusline text by spaces