Not clear how to install drivers

[rogthedodge]

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This probably python/sql 101 for many people but when trying Records out, I received a message saying it didn't have a protocol handler for mysqldb. It's been a real struggle to understand that I need to install a driver, to find a suitable version and install it on a macbook (I gave up after several hours) and eventually to install the driver from the mysql site. I still don't know if this will work with Records or whether I'll have to use it in its raw form.

[vlcinsky]

PR #135 is partially handling this, providing hint, that either used database, or used output format failed to import some missing package.

If someone elaborates list of database packages and output packages, it could be added to that message.

Optionally for databases, there might be some sqlalchemy page, explaining what packages might be needed, url to such page could be added to the message.

[vlcinsky]

PR #135 merged, partially improving the issue.

Dedicated page explaining recommended packages for various databases would help (wiki?).

[vlcinsky]

Issue #115 relates to it. It is proposing installation of records using extras feature to support particular database backends.

With such extras set a page providing instructions for using particular backend would be very simple.