Add export (txt, csv, json) and import #95
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In txt and CSV format, the cards belongs to a column (if any).
The JSON export format is basically a dump of the database records for the board. This JSON export is suitable for import.
The import removes everything that is in the board and puts the JSON content instead.
Second commit adds a revision system. Push the button and a "snapshot" of the board is stored in the database, suitable for JSON export and so for import.