constructs a point if suitable objects are selectd, or shows a popup-menu
with all possibilities to construct a point.
The point-button constructs a point if suitable objects are selectd, or shows a popup-menu
with all possibilities to construct a point.
In case several objects are selected the last of which is a transformation, Archimedes transforms all selected objects when pressing the point-button. Transformations are defined for points, segments and lines only, all other objects will be ignored.