Make script for MT/MST

[Remi-Gau]

• adapt expDesign
• present aperture on one side and cross on the other
• implement radial motion

[Remi-Gau]

• simplify or at least explain how some parameters are passed from one structure to another
• make sure that the speed value saved in the log file is in visual angles / sec

[Remi-Gau]

all unfinished tasks about radial motion moved to #50