The IDL compatibility checker script currently doesn't check brand new commands that don't have a corresponding old command, which we should check because we now check that 
all fields in the new IDL have specified the 'unstable' field .
We should modify the script to check new commands that don't have a corresponding old command as well. 

Or we could also modify the test_api_version_compatibility task to additionally run the script with the latest version as both the old and new directories:

 python buildscripts/idl/idl_check_compatibility.py -v --old-include src --new-include src src src

 That way brand new commands will be checked as well.