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Double copy-paste error! Must have been sleep-coding.

Argh! Apologies to translators! I completely forgot to uncomment this
tag, so this text would not have appeared on your radars sooner!

As before, these are mostly just skeletons.

This reverts commit 0aec661c
which accidentially deleted the start of configure.ac

This reverts commit 30ae981c.
Was actually already there!

The zoom focus discussion on IRC suggests that everybody is annoyed
about centering behavior (or lack thereof), so here is a way to
explicitly center the image witout zooming.

... _even at low zoom levels_

Pass GIMP_ZOOM_FOCUS_POINTER to gimp_display_shell_scale() when
wheel-scrolling, and change the scaling code to really honor
GIMP_ZOOM_FOCUS_POINTER and not apply magic image centering.

This keep the same point centered under the mouse for wheel-scrolling
and the zoom tool (== when the zooming is really triggered at a
certain mouse position).

This is mostly adding skeleton gtk-doc comments, but it's still much
easier for everybody to improve this than to add it from scratch.

Explaining in the intro that the reference is the code, and where to
find it.
Rather than writing uint32/64 for every offset, use "pointer" as a
proper and well defined basic data type, whose detailed description is
in the "BASIC CONCEPTS" section at the start of the file.

Implement GimpPickable::get_pixel_average(), added in the previous
commit, in GimpDrawable, GimpImage, and GimpProjection, using
gimp_gegl_average_color(), added in the commit before last.  This
is significantly faster than the default implementation.

... which calculates the average color of the pickable over a given
area.  Use this function in gimp_pickable_pick_color() when
sample_average is TRUE, and provide a default implementation which
calculates the average color using GimpPickable::get_pixel_at(), as
gimp_pickable_pick_color() did before.

The default implementation is rather slow; classes that implement
the GimpPickable interface can provide a faster specialized version
(see the next commit).

... which takes a GeglBuffer and calculates the average color over
a given area.

... for layer modes.
KDE developers asked me where the code was so that they could reproduce
actual algorithms in their XCF reader. This is obviously interesting
information to have around in our docs.

Add some info about endianness (and the bug we had between version 7 and
11) and layer masks being attachable to layer groups now.

Forgot to do this for 2.10.0.