[yt-dev] Issue #674: Error when importing from yt.analysis_modules.api (yt_analysis/yt)

New issue 674: Error when importing from yt.analysis_modules.api https://bitbucket.org/yt_analysis/yt/issue/674/error-when-importing-from Devin Silvia: Right now, if you try to import from yt.analysis_modules.api, you get an error that SZpack is needed and not available. I don't believe that SZpack should be a requirement and since it does not come with the yt install bundle, it should probably be dealt with more gracefully.