Added corresponding unit tests.

Catch more exceptions when checking for security problems -- otherwise a missing database causes a fatal error on Install/Home and prevents generation of database.

Eliminated Aleph driver dependency on service locator; added exception when X-server request is made without proper configuration.

Updated installer to auto-configure security (resolving VUFIND-733; thanks to Kyle McGrogan for initial implementation).

Thanks to Mark Triggs for initial research and Kyle McGrogan for implementation work.

Generate documentation for all modules (this only works right now if PhpDocumentor2 is hacked to disable graph generation).

Created separate phpcs task; adjusted which files get style-checked (all modules, minus tests and configurations).

Added unit tests for upgrade code; put old configurations from 1.x releases into test fixtures to support tests.

Added new upgrade functionality to match 1.4 upgrader and to make \VuFind\Config\Upgrade class easier to test.