This also fixes RST formatting for header lengths.

Noting version info on a per-method basis keeps this flexible if another method end up using the option in some later version.

This also removes "--prefer-source", which should result in Composer downloading dist releases by default.

Disable the "mongodb" service and remove installation through Travis' unmaintained apt package whitelist. Server versions are now manually downloaded and run with mongo-orchestration.

Since maxAwaitTimeMS is not a hard limit (the server may reply sooner), this will help avoid fragile test failures.

Thank you, PedantryTest.