* The REPL is aware of multiple implementations...
* and it knows how to create more than one connection for guile;
* but it's not been tested with more than one implementation.
* geiser-mode seems to be able to keep track of active REPLs.
* Evaluation system is now pluggable
* The rest of the system understands said pluggability
* Guile provides its own implementation (geiser-guile)
* The reload system is aware of the new kids on the block
