Overrode get_readonly_fields to make name readonly for existing object. Fixes #146. Also added field ordering.
Rewrote logic of clean() to validate by UID when re-activating, but validate by name when creating new.  Part of #146.
modified the help text for filterstream
changes for the default help -text
relocating method per the logical flow
Merge branch 't195-filterstream-help-change'