#5 Database connection

[vowitaf]

We need a plugin that can connect to a database securely and let people
pull data from it. Here's an initial list of things that it could provide:

- Connect to any database.
- Browse available tables.
- Search fields.
- Allow running SQL.

A little later:
- Transform data into models.
- Pipes that directly feed algorithms.
- Database-backed (read-only?) data models.

Please post any design ideas, references to existing APIs, etc.

[vowitaf]

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Created wiki page for design at:
http://iv.slis.indiana.edu/ivc/wiki/index.php?n=Version1.DatabaseConnection