- Also moved clearing of caches to ElementUtil.transformAll.

- Changed messages in APIS_transfer_interface into flows, because
messages between interface end ports was semantically incorrect and now
violated validateSubsettingConstantConformance.

- Also updated for proper KerML and SysML keywords.
- Results in no actual change to SysML.sysml over updates already done
for ST6RI-827.

- Removes need to clear caches for distinguishibility check.