- remove done entries from TODO
- remove over-eager nonnull declaration
Adding doc fragment on mixin method
Adding missing include
nx.tcl:
- Define method "value" as a slot forwarder to allow for calling
  value-less slot methods like e.g. "get" dispite of the arity-based
  forward dispatcher.
- extend regression test
Merge branch 'master' of ssh://alice.wu-wien.ac.at/usr/local/src/git-repo/nsf