Fix typo (GTK_ENABLE_DEBUG vs. G_ENABLE_DEBUG).

https://bugzilla.gnome.org/show_bug.cgi?id=726858
Updated Ukrainian translation
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gtk-demo: Fix underlines

The iconview example was showing literal underlines. We don't want
that.
Revert "Don't let themes override explicit border-width in dialogs"

This reverts commit 6e4567e73bceb66200b9605c51b4b5ad6e807483.

For some reason, this causes buttons in message dialogs to have an
unwanted border.
Don't let themes override explicit border-width in dialogs

This fixes an issue where the theme-provided border-width prevents
dialog contents from lining up properly with the headerbar. To make
this work in message dialogs, we have to explicitly set the border-
width of the action area to 0.
a11y: Don't unref relations

Nobody was reffing those related object in the first place and that
was causing random crashes.
And if somebody had reffed those related objects, they'd have caused
reference cycles.

https://bugzilla.gnome.org/show_bug.cgi?id=726838
a11y: Add API to update relationsets of cells to their parents
a11y: Move relationset updating to new vfunc

This way, we don't create lots of cell accessibles when creating the
first one (because surely one is the parent/child of another who again
is a parent/child of another who again....)
printing: Draw print dialog on fullscreen windows

Set correct "type-hint" for GtkPrintUnixDialog ("dialog").
Otherwise the print dialog is not shown when its parent
window is in fullscreen mode.

https://bugzilla.gnome.org/show_bug.cgi?id=724728
docs: Document gtk_recent_filter_filter() requirements

gtk_recent_filter_filter() needs the contains bitfield to be set, but
this only mentions that the other fields are required.

https://bugzilla.gnome.org/show_bug.cgi?id=726900
wayland: Mark ourselves as not supporting compositing

The compositing that is meant here is really specific to the
X11 Composite extension, and does not apply to Wayland.

This is very rarely used functionality anyway, and none of
the other backends support it.
Updated German translation
Also revert enable-mnemonics code in gtkwindow, which was forgotten in commit 34cf40e95cb1f0bc4bb98bb14edb03dd86f1dab3.

https://bugzilla.gnome.org/show_bug.cgi?id=708346
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