Better vignette import from Lightroom.

This new version is far more accurate by taking into account
the roundness parameter.
A cleaner, although magical, code formatting solution for emacs users.
Merge pull request #158 from levitte/misc

A cleaner, although magical, code formatting solution for emacs users.
Initialize crop aspect in GUI based on actual crop data.

This is a usability fix ensuring that the crop is not changed
because previous visited image had another aspect ratio.
Refine previous algorithm to find the aspect ration.

We now look for the closest known aspect ratio, if above a
certain epsilon we set to free aspect.
Add support for grain Lr import.
Add support for flip (orientation) Lr import.
Remove useless casting.
Refine previous algorithm to find the aspect ratio.
Merge branch 'po/lr-import'

* po/lr-import:
  Remove useless casting.
  Add support for flip (orientation) Lr import.
  Add support for grain Lr import.
Merge branch 'master' into opencl
opencl: re-activate dt_opencl_finish() in loops of nlmeans/denoiseprofile

without this blocking synchronization point our pixelpipe consumes such a
big part of GPU cycles that screen updates get very jerky
dng: don't delete meaningful exif in case of dng.
fixed segfault when loading half-corrupted xmp
Release strings allocated by dt_conf_get_string
Make sure dt_get_lightroom_xmp is thread safe.

Remove static variable.
Check for iop versions in Lr import.

This is needed to avoid crash if some old and imcompatible iop
shared libraries are around.
Update some french translations.
Merge branch 'master' into opencl
fix a memleak.