bug fix for AO (^O) in if statement tuple,

normalize other related tuples w/trailing commas
EOR_CMD -> EOR, matching related EL, EC, etc.
logical-order bug fix, fix server func byte `0'
fix if statement responding to '^[send getstatus'
docfix: note this is the core 'iac interpreter'
remove unused err value
docfix: comment-about why we skip on is_oob
interrupt_received -> special_received,

better SLC mapping for both handle_ayt and others
pep8, docfixes, comments, that sort of thing