remove unused support for tuples in rmf
simplify hdf5 code a bit
remove unused methods
pull fan out into wrapper class
move avro to new interface too
bring in new typedefs
clean up things a bit
fix some const
some syncs
more steps towards cleanup
bring external interface for SharedData up to new one
move clone functionality to act directly on the shared data

then it can be used in the RMF rewrite
nullable output works
update benchmarks as they were broken
add nullable to changelog
update docs
clean up functions to create frames
simplify getting of frame attributes
clean up cloning a bit
be much more strict on frames