Research/experiment with ruamel.yaml as an alternative to pyyaml

[drdavella]

http://yaml.readthedocs.io/en/latest/pyyaml.html https://pypi.python.org/pypi/ruamel.yaml

ruamel.yaml appears to be under active development, whereas pyyaml has not been updated since 2016. It might be worth considering whether we should migrate to a newer library, as long as it meets our needs. It's also possible that ruamel.yaml might be more performant since it appears to be built with C extensions and/or Cython. This may make it less portable, though. It's also worth noting that ruamel.yaml supports YAML 1.1 and 1.2, whereas pyyaml only supports 1.1.

[Cadair]

It should be reasonably trivial to support both. Certainly for versions of ruamel compatible with pyyaml