ggiWmhZOrder - Raising and lowering a window
int ggiWmhZOrder(ggi_visual_t vis,enum ggi_wmh_ordercmd command);
ggiWmhZOrder raises windows up or lowers down as specified in the
GGI_WMH_ZO_TOP raises the window to the top. It overlaps all windows,
including non-GGI ones.
GG_WMH_ZO_BOTTOM puts the window to the bottom. All other windows,
including non-GGI ones, overlap it.
GGI_WMH_ZO_ONE_UP, GGI_WMH_ZO_ONE_DOWN raises or lowers the window one
level up or down.
Important: The ZO_* are deprecated and are going to be removed.
They are just aliases for the new ones to allow users a smooth
ggiWmhZOrder returns 0 for success, otherwise an ggi-error(3) code on