lens iop: Automatically set scale.
Added support for sorted lens lists in lens correction module.  Needs LensFun >= 0.2.9.
added option to overwrite file in export to file on disk.
updated to remove conf usage
Merge branch 'master' of https://github.com/darktable-org/darktable
usermanual : rework lua attributes according to what upegelow told me to do
Merge branch 'master' into usermanual
usermanual.lua: a few fixes
Merge branch 'master' into usermanual
usermanual : fix link id to be XML compliant
usermanual: a first small step to make xmllint happy
usermanual: further minor fix in usermanual.lua
Instead of having a configuration option, put the "normal" preview under the z key and preview with focus detection under ctrl-z.
preview with focusdectect is not mapped undr Z, it's mapped under ctrl-z
usermanual: make xmllint happy
multi_name is a static string, fix test.

And initialize the string to empty. Cleaner and faster.
Move declaration where needed. Code clean-up.
New static routine to set the panel label.

Preparatory work for #9704.
New routine to update the panel header.

This routine update now the panel label. This is needed to be able to
display the proper multi-instance name when switching images.

Preparatory work for #9704.
When switching images make sure the header is updated.

This set the proper multi-name for the corresponding instance.

For #9704.