change back to release build by default
refactor how the label cache is processed in ms 6.4 vs ms 6.5 and later.  In 6.4 we assume status = MS_ON is valid.  In 6.5 we use the rendered_text_symbols array.  In both cases, the return type has been changed to a flat array and it contains just the labels that were rendered.
fix version number in tests.
Merge pull request #2 from pagameba/enumerate-labelcache

Enumerate labelcache