issue2551099 - disable processing of data url's in markdown. Display as plain text. Added 'data' to templating.py _disable_url_schemes array. User should be able to re-enable it by changing the array from the tracker's interfaces.py. Markdown tests failed before the change to _disable_url_schemes. Also add second separate data test for ReST and plain text processing. data url's look like they are already ignored in these proess streams.

def preset_new(db, cl, nodeid, newvalues):
    """ Make sure the status is set on new issues"""

    if 'status' in newvalues and newvalues['status']:
        return

    new = db.status.lookup('new')
    newvalues['status'] = new


def init(db):
    # fire before changes are made
    db.issue.audit('create', preset_new)