Merge pull request #266 from thriuin/master

update for JIRA 506 - use file extension keys from the schema
add openness score to proposed_schema.xls
generate schema with openness scores
order formats by proposed list order
build_schema merge(): explicit mappings for formats
fix loading openness scores from proposed
remove now-unneeded comment
openness_score helper: use score from schema
Merge pull request #267 from wardi/master

fixes for openness calculations, move openness scores to proposed_schema.xls