- some further optimization of estimated size calculation.

- some checkings on used/available disk space.

- big issue: exchange the KFileDetailView with a new Class
  without automatic sorting ...
  this class should have similar (or same) Interface as
  KFileDetailView, but only for actually used functions.

- dvdauthor will process only one entry of a bunch of equal vob file
  entries. but this affects LVE edit list files (.prj) only because lack
  of temporary mapfile and is not very urgent (-> a dummy mapfile could
  help here).
