Adds protocol table output to sideways dump

Added script protocol_table.rb to sideways dump and updated README
with explanation for it.
Run after make_table.rb, it will create a table correlating
the protocols of a submission to their types listed in the sub's attributes.

Also suppressed 'duplicate rank' message in make_table since it's actually quite
common.
Merge branch 'master' of https://github.com/ellen-k/encode-db-dump