Move upgrade directions for version < 1.5.0 to history document The upgrading doc is huge. Most people don't need docs more than 10 years old. Move docs for versions less than 1.5.0 (July 2013) to upgrading-history.txt. Probably could cut this back to 5 years (1.6.0 release in 2018) but lets go with 10 for now.

def audit_html_files(db, cl, nodeid, newvalues):
    if 'type' in newvalues and newvalues['type'] == 'text/html':
        newvalues['type'] = 'text/plain'
    

def init(db):
    db.file.audit('set', audit_html_files)
    db.file.audit('create', audit_html_files)