Merge commit 'origin/stable'

Conflicts:

	AUTHORS
	NEWS
	configure.ac
	lib/gtksheet/gtkitementry.c
	po/LINGUAS
	po/nl.po
	src/data/file-name.c
	src/data/sys-file-writer.c
	src/language/stats/crosstabs.q
	src/language/stats/examine.q
	src/language/stats/t-test.q
	src/output/charts/box-whisker.c
	src/output/charts/plot-hist.c
	src/ui/gui/output-viewer.c
	src/ui/gui/psppire.c
	src/ui/gui/psppire.h
	src/ui/terminal/main.c