February 2019 release

Improve documentation of how to configure non-hermetic dependencies (Lua, Python, NumPy).
Add 'allowHoldOutLevels' setting to allow running of levels that should not be trained on, but held out for evaluation.
Add logging library 'common.log', which provides the ability to control which log messages are emitted via the setting 'logLevel'.
Update the ioq3 upstream code to the latest state.
Lua 5.1 is now downloaded and built from source, and is thus no longer a required local dependency.
A minimal version of the "realpath" utility is now bundled with the code, and thus "realpath" is no longer a required local dependency.

Improve documentation of how to configure non-hermetic dependencies (Lua, Python, NumPy).
Add 'allowHoldOutLevels' setting to allow running of levels that should not be trained on, but held out for evaluation.
Add logging library 'common.log', which provides the ability to control which log messages are emitted via the setting 'logLevel'.
Update the ioq3 upstream code to the latest state.
Lua 5.1 is now downloaded and built from source, and is thus no longer a required local dependency.
A minimal version of the "realpath" utility is now bundled with the code, and thus "realpath" is no longer a required local dependency.

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