Consistently call it the CAN frame _format_ in Message Network S&TN

[bobjacobsen]

See Issue #62. Includes corresponding update to the MtiAllocations file:

[bakerstu]

@bobjacobsen I think you linked to the wrong tag in the description. Perhaps you intended #62?

[bobjacobsen]

Thanks. Fixed.

[balazsracz]

This looks good to me, but there is still an inconsistency with CanFrameTransferS. Specifically, the Variable Field is defined as 12-bit here, and in CanFrameTransferS it is defined as a 15-bit field (see table 1 there)

[bobjacobsen]

Will convert Variable Field in the CAN Frame Transfer to Content Field later this evening.