Merge commit 'upstream/1.11.1.1'

Merge commit 'upstream/1.11.1.1'

Conflicts:
	ChangeLog.txt
	TODO
	configure
	debian/changelog
	debian/control
	debian/copyright
	debian/libmgl-fltk5.install
	debian/libmgl5.install
	debian/mathgl.install
	debian/mgl2cpp.1
	debian/mgl2eps.1
	debian/mgl2gif.1
	debian/mgl2png.1
	debian/mgl2svg.1
	debian/mglview.1
	debian/patches/dircategory-and-direntry-mathgl-en-texi.patch
	debian/patches/series
	debian/python-mathgl.install
	debian/rules
	examples/full_test.cpp
	include/mgl/mgl.h
	include/mgl/mgl_ab.h
	include/mgl/mgl_define.h
	mgl/Makefile.in
	mgl/mgl_ab.cpp
	mgl/mgl_crust.cpp
	mgl/mgl_data_io.cpp
	mgl/mgl_exec.cpp
	mgl/mgl_zb.cpp
	mgl/mgl_zb2.cpp
	texinfo/Makefile.am
	texinfo/Makefile.in
	texinfo/mgl_en.texi
	texinfo/mgl_ru.texi