Remove superfuous declaration.
Add minor comment.
Add support for adding a style while exporting.

This makes it possible to apply a specific style for some export
location like a watermark when exporting to Picasa for example.

At the same point it is more general as any style can be applied
at export time. This could be useful too when exporting for
printing where a different kind of sharpness is needed.
Merge branch 'export-style' of https://github.com/TurboGit/darktable
styles on export: make presets work with it.
Merge remote-tracking branch 'origin/master'
Add support for retrieving only the active ops in history.

Will be used by the new history dialog.
styles on export: remove duplicate storage of style string in presets.
style on export: tooltip to express temporary and additional nature.
prefer usual libraries over frameworks on OS X
Remove old commented out code
Merge branch 'master' of ssh://github.com/darktable-org/darktable
dithering: small fix for display of scaled down images
Factorize code to compute image offset in collection.
Fix film strip offset computing.

This may be due to a bug in SQlite as the request of the form:

   select rowid from (select * from images);

returns a suite of empty lines instead of the rowid. This was used
to compute the offset of the filmstrip and so the selected image
was never properly put in the center.

The workaround is to do part of the computation directly in C.
noise profile: preset for sony a200 contributed by Filip Wostyn
noise profile: presets for 60d by florian manschwetus
reorder arguments in OSX appbundle start script to avoid confusing the OS
avoid importing twice when OSX integration is turned on:
it seems that paths passed as command line arguments generate OpenFile events too
Add new dialog to copy part of ops.

This will be used in lightable and in the darkroom filmstrip to select
the ops to copy in the history. Currently all the history is copied.