* allow for YAML(typ=['unsafe', 'pytypes'])
* fix output of TAG directives with #
* move setting of version based on YAML directive to scanner, allowing to
check for file version during TAG directive scanning
* preserve YAML and TAG directives on roundtrip, correctly output # in URL
for YAML 1.2
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-ruamel.yaml?expand=0&rev=42