v0.2.0

From this release on forward, artifacts are published to sonatype.

Implicit chains are now printed as trees, visualizing the nesting levels. Subchains branching off another are indented to their level in the parent chain.
This is the default behaviour now, it can be deactivated by setting the parameter tree to false.

Chains can be truncated to only print the first and last element, skipping over potentially useless intermediates that clobber the output. To activate the feature, set the parameter compact.