Fix aspect ratio in scaling

Sorry, stupid brain fart ...
Lens IOP: reload_defaults(): fix typo
usermanual: update list of manual contributors
Merge branch 'master' of https://github.com/darktable-org/darktable
lua : remove lib.container lib.view and lib.position

they are not really userfull with the current feature set and
lib.position is not reliable

will reactivate after next release
lua api: correctly make <programlisting> in proper <para>
usermanual: small structural changes in opencl docs
lua api : fix an incorrect name in api
Merge branch 'master' of ssh://github.com/darktable-org/darktable
Merge branch 'master' of https://github.com/darktable-org/darktable
Minor change in French usermanual
Update French translation.
Show the same variables for export as in disk

This seems to be an oversight from
ecc14f0e52e4b0efe34795334467d9d2abb5afd2
Don't depend on a max size for variables tooltip

Fixes #10190
Merge branch 'master' of https://github.com/darktable-org/darktable
Minor changes in the French translation of the usermanual after a git pull upstream master