Revert "add xml files"

This reverts commit 86c7626629edd4d6094f17d4134b70f58b0d5919.
Merge branch 'dev' of github.com:lengagne/mogs_direct_motion_optimization into dev
Revert "Revert "add null velocity in constraint""

This reverts commit 19b590629dc927b68a87bbb7e622a247682b5e64.