zodb / relstorage / 945

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Fix #270, fix #271 and fix #272

(Yes, all in one commit. I'm sorry.)

Introduce a strict mode for testing, and use the server-side cursor in
MySQLdb when that's the case. It raises the ProgrammingError we were
seeing in #270 consistently, so find and fix all of those.

At the same time, make the gevent MySQLdb driver more cooperative, and
make OID GC block for less time.

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