Move the source pattern transformation to the outside of _cairo_gstate_clip_and_composite_trapezoids() instead of doing it at the leaves.
Change size of output surface for aesthetics.
Updated to correspond to the current definition.
Remove source-surface-scale-paint.
reviewed by: cworth
Port to use new cairo_create interface.
Rewrite all tests that were using cairo_set_target_surface to instead create a temporary cairo_t, (eventually to be replaced with cairo_begin_group).
Remove cairo_show_surface. Add new cairo_set_source_surface.
Remove _cairo_gstate_show_surface.
Replace calls to cairo_show_surface with cairo_set_source_surface; cairo_paint.
Fix messages to prefer - over _.
Fix documentation.
Three new tests to exercise set_source_surface more completely, (two of these are expected failures dues to outstanding bugs).