Activate GUI for watermark layout.

It is now possible to layout properly a watermark whose scale is
computed based on the larger or smaller border. This make it possible
to use a watermark inside a style an apply it into images in portrait
and landscape mode with proper layout.
Workaround for libgphoto2 API breakage in 2.5.0. Fixes red hat bug #892228.

Thanks to jpopelka for debugging and proposed patch. :-)

Signed-off-by: Christian Tellefsen <chris-git@tellefsen.net>
Merge pull request #203 from christte/gphoto25apifix

Workaround for libgphoto2 API breakage in 2.5.0. Fixes red hat bug #892228
noise profile: updated GX1 profile
noise profile: removed duplicate line.
usermanual: minor updates
Merge branch 'master' of ssh://github.com/darktable-org/darktable
film strip: try to be thread safe while switching images.
usermanual: recommend to not use module in its current state
Merge branch 'master' of ssh://github.com/darktable-org/darktable
Update pt_BR translation
Merge pull request #204 from guitorri/update_pt_BR

Update pt_BR translation
Revert "film strip: try to be thread safe while switching images."

This reverts commit 683f827b4a64de71c6c3598c4c2fbcec35ed84ac.

didn't quite solve it.
pixelpipe: introduce mutices for pipelines while develop_t uses them.
darkroom: lock pixelpipes before destroying them.

should fix crashes/hangs when pressing spacebar like crazy.
[l10n] Swedish update
Fix aspect ratio computation.

It cannot happen in legacy_params() as at this point the size of the
image is not yet known. We then use a deferred circuitry to handle
this at the right point in the code.

Fixes #9320.
Merge branch 'fix-clipping-aspect'

* fix-clipping-aspect:
  Fix aspect ratio computation.
Preliminary update of the Russian translation
fix: denoiseprofile: also show "found match:" instead of the profile name for index 0