Long term plans

use task interface everywhere (issue509)
remove preprocessor (issue26)
state representation (issue401)
life-time management of shared objects (e.g. CG) (related: issue564)
rethink which shared objects can go together (e.g. when is it OK for a heuristic to use a different task than a search algorithm using it? When is it OK for a pattern selector to work with a different task? a landmark factory? an operator-counting constraint generator? etc.)
Objects created by plug-ins: what should they be called? When do we need a factory, and when does the plug-in generate the object directly? How is their lifetime managed -- when should we use shared_ptr and when should we use raw pointer?
plugins for open lists (issue610)
remove global objects
group code into namespaces and core (issue64)
new plugin types without code changes in option parser (issue588)

Needs tender love and care