* sort order for trailing qualifier values (lexical as in OBO-Edit)
* try to preserve relationship tags in obo2owl roundtrips for
is_meta_data tag level relations (i.e. never_in_taxon)
* remove some dead code
* only try to translate to relationships for term frames
* fix test: set proper type for external links
add test case for labeled xrefs

git-svn-id: http://oboformat.googlecode.com/svn/trunk@609 3e622410-f0ad-ce59-49ea-9bf623c22f00
make oboformat 0.5.5 release