Converted to single module project

Removed the "bioformats" subcomponent. Converted the top-level
multi-module pom to a single module.

There is now just "scifio-lifesci" to match the repository naming. All
GPL life science SCIFIO formats belong in this component.
SDTFormat: added CNAME to metadata

The CNAME constant is used for translation between Metadata. There isn't
a SDT translator yet, so it isn't strictly necessary, but better to add
it for now.