Blue categories in book edit can be now marked as user added by right clicking them with a mouse
Added one second dealy (after the user stops typing) after which the search gets executed, so that the search won't get executed after each fast keystroke
Loading speed optimizations for the bookgrid
Progress bar (busybar) from the main window is now also shown in the task bar
Fixed blurry description text in the row detail
Added option to ignore  book covers with wrong dimensions during book adding
Added some additional fields to the book table
Removed category column
Added  filter window
Changed application icon
Some additional changes and fixes