Changes to allow MBTA events to be submitted via coinc.xml files. Submitting by .gwf files now gives a deprecation warning.

Fixed event creation logic (in API only) for backwards compatibility with old client. The new function fix_old_creation_request will take a request object from the old client (which has analysisType), guess at the pipeline and search, and then insert those into the request object.

Fix for Issue #975, 'Versioned files displaying only newest versions in event detail page'. To fix this, we add a file_version field to the event log. This is accessed from the VersionedFile object at the time of file-saving. That way, the correct version can always be associated with any given log message.

gracedb search GRB --columns=created
ERROR: 'unicode' object has no attribute 'isoformat'

Bug introduced in commit 3b31d9d3
    changed created time in eventToDict to UTC

https://bugs.ligo.org/redmine/issues/974