Dem volume insertion initial velocities

[OGaboriault]

Description of the problem

• This is a follow up from Victor's comment from PR [#1074

The initial velocity and initial angular velocity are now define with one parameter each.

Really quick PR.

No example or application test (except for one) was using those parameters.

[blaisb]

Ohh shoot, did not see the comments before the merge. You can fix them in a secondary quick PR @OGaboriault