rename FAst and FAstN
clean
get rid of eoi_entry
eli support should be stripped later ...
remove all EOI
clean
tweak
automatic antization :-)
clean
clean
clean
tweak
consistent behavior for pattern and expression construction...
Note that you should be careful if you construct the ast by  hand instead of by quasi quotation -- the invariant is harder to keep track of
tweak
sync up plc
sync up unites
clean