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Previously flag writable was used. This caused ritable and editable
brushes to sort first. This was not clearly understood criteria.
Now user brushes in writable folders are sorted first.

Really find a *widget* in gimp_dialog_factory_find_widget(), don't
just return the first found session info's widget. It's perfectly fine
for a session info to have a NULL widget, if that dialog is not
currently open.

so it works right in SWM. Fixed actions/, tools/, and app/ for now.

to ::show_dockable_dialog() because that's what it wlays does, no
matter if the dialog has to be created or now.

In SWM, try to find an existing dialog in
gimp_single_window_strategy_create_dockable_dialog() before falling
back to creating a new one.

Which is right for all external users, GimpDialogFactory itself splits
the identifier list itself if needed before finding a specific dialog.

Add app/widgets/gimppanedbox.c to POTFILES.in

- move the code that sets the tool options' "defined" and "serialize"
  properties from GimpToolInto to GimpToolOptions so they are always
  set correctly.
- make GimpToolOptions fix broken serialized NULL tools automatically.
- make sure a GimpToolPreset's tool options always has a tool set. If all
  fails, set a NULL tool explicitly and let the logic in GimpToolOptions
  find the right tool.
- set GimpToolPreset's "use" booleans to FALSE for context properties
  that have no effect on the tool.
- set GimpToolPresetEditor's toggle insensitive for these properties.

Make "Right" rotate right and "Left" rotate left.

use a guint for Tile's share_count member