provide autoscale option for Qt plotting (bug #44307) * Canvas.h, Canvas.cc (Canvas::autoAxes): New pure virtual function. (Canvas::canvasAutoAxes): New function. (autoscale_axes): New static function. (Canvas::canvasMouseDoubleClickEvent, Canvas::canvasMousePressEvent): Use it. * Figure.h, Figure.cc (Figure::createFigureToolBarAndMenuBar): Add autoscale button to window. (Figure::autoAxes): New function. * GLCanvas.h, GLCanvas.cc (GLCanvas::autoAxes): New function.

EXTRA_DIST += \
  m4/module.mk \
  m4/ax_blas.m4 \
  m4/ax_blas_f77_func.m4 \
  m4/ax_compare_version.m4 \
  m4/ax_lapack.m4 \
  m4/ax_openmp.m4 \
  m4/ax_pthread.m4 \
  m4/gnulib-cache.m4 \
  m4/libtool.m4 \
  m4/ltoptions.m4 \
  m4/ltsugar.m4 \
  m4/ltversion.m4 \
  m4/lt~obsolete.m4 \
  m4/pkg.m4