Bug: setting rigid body from frame

[Hannah Weller]

When setting a rigid body from a frame within the trial, rigid body transformation doesn't update – have to export references to a CSV and then import that reference CSV to get transformations out.

[Xin Zhang]

Spotted this problem as well

[Benjamin Knorlein]

fixes #156 : Transformations are correctly updated when the references are changed in the Rigid Body Dialog

→ <<cset 59dc35ecd5fc>>