Terminate torso with sacrum, not pelvis

[vikashplus]

Akin to other torso models

End the new toeso model via sacrum bone

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The pelvis bone will come from the myolegs models when they are combined the torso model

[cherylwang20]

terminating torso model here: ae9fccc, changes also apply to one with exosuit

[vikashplus]

there seems to be a rather large gap between the lumbar and the sacrum

[cherylwang20]

Updated here: 95e25c4e7bb9c7e861d5a541baf90541225780bc