ENH: prune the extra_source_files in convert subcommand.
ENH: prune the extra_source_files in convert subcommand.

abadger/Bento,cournape/Bento,cournape/Bento,cournape/Bento,abadger/Bento,abadger/Bento,abadger/Bento,cournape/Bento