Release 0.3.1

CHANGES:

* Bugfix: RList.singleton_s: make sure to keep intermediate signal alive.

Release 0.2.4

CHANGES:

* Bugfix: RList.singleton_s: make sure to keep intermediate signal alive.

Misc: update license, fix #28

new functions; do not use generic hashtable

Version 0.2.1.

Version 0.2.

clean