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This reverts commit ff12023f.

Because libgda-6.0 is not ready yet.

Conflicts:
	configure.ac

Because the gtk_widget_override_*() functions are deprecated.

This reverts part of d8730c41.

The commented-out changes would have been wrong because they
were method calls on Entries, not Labels.

This reverts part of d8730c41.

It has mistakenly replaced Entry::set_alignment() with
Widget::set_halign() instead of only replacing Misc::set_alignment().

Now the fields take up their full widths again, so the extra buttons
(New, Find, ..., etc) are not far away.

Conflicts:
	glom/utility_widgets/layoutwidgetbase.cc

Instead of Widget's xalign, which acts on the whole widget,
not just its text content.
See http://www.murrayc.com/permalink/2015/03/02/gtk-aligning-justification-in-text-widgets/

By temporarily unsetting LANGUAGE while getting LC_TIME via
setlocale(LC_TIME, NULL). As Geary does already too.

So we have the correct 4 digit date formats for those too,
even where the default behaviour is incorrect.

Also add a regression test for this.

Bug #742968

* glom/utility_widgets/notebook_noframe.[h|cc]:
  Add a hacky remove_all_pages_without_signalling() method
  to avoid us calling get_parent() while this widget is being
  removed, because that is causing get_parent() to be called on
  a GtkWidget that is no longer valid. This has started happening
  recently so I suspect a change in GTK+ or gtkmm.
  I have not put in the time to identify what is really going
  wrong.
* glom/mode_data/notebook_data.cc: Destructor: Call the new
  workaround method.