Transmitter model has been refactored by changing the current schema
from Transmitter and Suggestion models to TransmitterEntry model and
two proxy models TransmitterSuggestion and Transmitter:
* TransmitterEntry model will hold all the entries and changes on
transmitter entries in db.
* TransmitterSuggestion model will be the proxy model of the unreviewed
transmitter entries.
* Transmitter model will be the proxy model of the latest approved and
reviewed transmitter entries.
There are also change on Transmitter model fields:
* alive field is now change to status field
* there are new fields: citation, user, reviewed and created
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