Created the User_functions.test_dx_map GUI test.
This extensively checks the 'point' argument for the dx.map user function GUI window. This is to catch bug #22102 (https://gna.org/bugs/?22102), the point argument of the dx.map user function being incorrect in the GUI.
Authored by: bugman 2014-05-28
Parent: [r23520]
Child: [r23522]
