Merge branch '17-add-external-motor' into '2.0.x'

Resolve "add external motor"

Closes #17 (closed)

See merge request !50 (merged)

(cherry picked from commit b64c6dbd)

c5b9f8af add external motor to fscan and fscan2d aedd6bd3 fix various typos 1d0c4916 Correct usage of fscan/fscan2d using standard motor (not external) which 20403475 add support for external motors on fscan3d as for fscan/fscan2d. aa140123 disable printing of velocity changes. Annoying on fscan2d/fscan3d which b9d649f4 debug merging from 1.0 to 2.0

Co-authored-by: Emmanuel Papillon papillon@esrf.fr