Make sure that e-mail exports are not overwritten.

Use dt_image_path_append_version to add the version of the image being
developped.

Better fix #9722.
lua : disable message on startup

this message was here to help packagers check that lua was enabled

there has been enough feedback, disable it for release
Add some checks to ensure that a local copy can be created.

Without this checks dt could be in an inconsistent state with
no local copies created but the local copy status set on the
images. Furthermore, in this case the local copy status cannot
be removed.

At this stage we cannot create new messages so we just exit
silently. It is still better as the local copy status won't
be displayed on the lighttable.
Fix #9725: Allow numpad +,-,<del> in geotagging
Mention that our Lua is not compilable on Windows
lua : correctly use dup version when naming temporary files

fix bug 9722
blacklist FUJI cameras with X-TRANS sensors to prevent LibRaw from crashing
Merge pull request #407 from upegelow/x-trans

blacklist FUJI cameras with X-TRANS sensors to prevent LibRaw from crash...