data-type is primary, not the format, flip the status printf.
Relax the type configuration string checking, it can be any application
extension data-source, not just file or lsm.
Stop any attempt to layer LSM on top of anything other than a btree
in the API.
Loosen up the API check, dump/load passes in unmodified metadata strings,
and they potentially have both source and type values.  Let source through,
and only complain if the type doesn't match the URI.
whitespace
Allow arbitrary data source types for indices as well as column groups.
Merge pull request #545 from wiredtiger/relax-types

Allows arbitrary data sources to be configured as a "type" underneath column groups or indices.