fixed opening files from quicklist
added draft document on notes mechanism
added notes databases to datastore

removed notes from command and file tables, as these
are handled in separate tables
refactored and extended notes

- notes are now divided in three categories:
  global, file and command
- global notes work as before
- file notes are dependent on the currently selected
  file
- command notes are dependent on the currently selected
  command
updated draft for notes