Adjust for changes in plural reform
Change overview illustration on object life cycle in Class.man
nsf.c:
- dropped unused object::info::is
- renamed
   ::nsf::methods::class::info::filtermethods  -> ::nsf::methods::class::info::filters
   ::nsf::methods::object::info::filtermethods -> ::nsf::methods::object::info::filters
   ::nsf::methods::class::info::mixinclasses   -> ::nsf::methods::class::info::mixins
   ::nsf::methods::object::info::mixinclasses  -> ::nsf::methods::object::info::mixins
Revised life-cycle section further
nsf.c:
- provide error messages for ambiguous abbreviations
- extend regression test (now 5460 tests)
Merge branch 'master' of ssh://alice.wu-wien.ac.at/usr/local/src/git-repo/nsf