Remove oldies
Fix obstacle generation in .kaos export
Distinguish between goal and obstacle refinements.
Use --debug when delegating to mono.
Fix dot exporter.
Synchronize minepump.json with .kaos version.
Remove focus, towards an extended selection mechanism.
Add parent/child rule + fix.
Factorize rules inside its own module.
Start Model "navigation" helpers.
Add a goal_descendants helper.
Add helpers on Model::Selection.
Move minepump under its own folder.
Start an Model::Operator module for the "algebra".
Rename Model#selection as Model#select
Let Typed accept an empty hash.
Add a minus operator.
Add Model#+ (union operator)
Introduce Typed#each_attribute
Align with last meta-model/language.