Restructuring __* doc fragments to an life-cycle section; -superclass --> -superclasses
Revising lifecycle section; adding TODOs
nx.tcl: pluralism reform part 2
- changed methods
    /cls/ info subclass -> /cls/ info subclasses
    /cls/ info superclass -> /cls/ info superclasses
    /cls/ mixin ... -> /cls/ mixins
    /cls/ filter ... -> /cls/ filters
    /cls/ object mixin ... -> /cls/ object mixins
    /cls/ object filter ... -> /cls/ object filters
- changed configure parameters
    /cls/ configure -mixin -> /cls/ configure -mixins
    /cls/ configure -filter -> /cls/ configure -filters
    /obj/ configure -object-mixin -> /obj/ configure -object-mixins
    /obj/ configure -object-filter -> /obj/ configure -object-filters
- added handling for calling relationslot with unknown sub method
Merge branch 'master' of ssh://alice.wu-wien.ac.at/usr/local/src/git-repo/nsf