usermanual: few more images
Add original filename to XMP metadata

This adds the Xmp.xmpMM.DerivedFrom in both the .xmp file as well as the
exported image file.
Fixes #9064.
noise profiling: add two more papers worth of stuff.
usermanual: add example image for framing module
Remove a suspicious ";" after between an if statement and its body

Spotted by clang.
Only use "-fexpensive-optimizations" when building with GCC

For instance, clang doesn't support this option.
Add missing return statement in write_image

Spotted by clang.
Mark unused functions as such in points.h

Spotted by clang.
dt_bauhaus_slider_new_with_range() takes an int as last arg

... not a float.

Spotted by clang.
On *BSD, it seems that libintl is only required by GCC, not clang

Or maybe, that's clang who doesn't want libintl...
set_grid_color() and set_indicator_color() take boolean as last arg

... not float.

CAUTION: Floats are changed to the integer value they were implicitly
converted too before this fix. However, those values may not be the
correct ones.

Spotted by clang.
Merge pull request #77 from dumbbell/fexpensive-optimizations-is-gcc-specific

Only use "-fexpensive-optimizations" when building with GCC
Merge pull request #80 from dumbbell/mark-unused-functions-in-points.h

Mark unused functions as such in points.h
Merge pull request #81 from dumbbell/missing-return-in-write_image

Add missing return statement in write_image
Merge pull request #83 from dumbbell/clang-does-not-want-libintl

On *BSD, it seems that libintl is only required by GCC, not clang
usermanual: update on module tonemapping and a few other fixes
Merge branch 'master' of ssh://github.com/darktable-org/darktable
Merge pull request #79 from dumbbell/empty-if-body-in-gradientslider.c

Remove a suspicious ";" after between an if statement and its body
Show camera settings when reentering tethering mode
Pentax K-5 II standard matrix