Better control of output style for mapping and sequence nodes #149
Description
#148 introduces some hacks to allow setting whether a container node should be output in block style or flow style (because libfyaml does not currently allow setting the node style). Furthermore the intention was to allow controlling whether or not the node was written on one line as explained here: #148 (comment)
Due to a bug in libfyaml 0.9.2 which I was testing against locally, this happened to work exactly as I wanted, but it turns out there's officially no way to preserve how a node was styled exactly in the way it was originally parsed--perfect round-tripping is not possible here. This is a limitation in libfyaml that can't be easily worked around, though I would still consider this a bug for libasdf.