formatting in movement menu

[kchall]

There are some really nice horizontal lines that separate out the different parts of the "axis" options in the Movement module; could similar structure be added to the "plane" options?

Axis:

Plane:

[kvesik]

The horizontal lines are associated with "subgroups", which I originally constructed in order to make sure mutual exclusivity of radio-button selection was in effect only within a subgroup and not across subgroups. To whomever ends up working on this-- subgroups are likely the best candidate for addressing this issue, but just a caution to make sure that the selection behaviour for checkboxes works the same as without the subgroups.