href now also static method on branches and repos
value preview is updated again
added revision info so that metrics can be viewed in detail when clicking on the metrics chart.
Merge branch 'master' into feature-packages
measurements now expect a clear structure. this reduces the code complexity. added a utility method to retrieve hrefs for objects. introduced package structure. added sql median query.
added cmetrics. analyze error also catches error if package update fails. added purge method for repos. deletes all local data. only one root package per branch possible. otherwise some query qould be hard to not possible. newest files can be set to a date, to get all files present in a repo at a given point in time. added custom confirm dialog. removed branch and author count from repo overview. sending emails can be disabled using the SEND_EMAILS flag in the settings.