Add computed MSID to return Quat for quaternion MSID sets

[taldcroft]

Description

This adds a convenience interface to allow getting Quat objects for spacecraft telemetry directly from the cheta archive.

This defines the following computed MSIDs based on the corresponding TDB MSIDs:

• quat_aoattqt = AOATTQT[1-4]
• quat_aoatupq = AOATUPQ[1-3]
• quat_aocmdqt = AOCMDQT[1-3]
• quat_aotarqt = AOTARQT[1-3]

Interface impacts

None

Testing

Unit tests

• Mac (with new unit tests)

Independent check of unit tests by [REVIEWER NAME]

• [PLATFORM]:

Functional tests

No functional testing.

[javierggt]

It looks good to me. I looked at the code and ran the tests on HEAD. The tests seem to check the right thing.

I would note that in general this might require the improved normalize function in Quaternion, and this is not tested.

[taldcroft]

Yeah, testing for bad quats in telemetry might be a good thing, but it should just work. Since this functionality is already a little obscure and in the interest of keeping things moving I'm just merging.