- use now class-only for all methods methods of meta-classes. Methods of meta-classes are intended to be applied on classes, one should not change this via per-object mixins. - respect class-only in "info callable methods|method" - extended regression test - provided relation name "object-filter" to slot filter.
- experimental method-property "class-only": this allows to make object save against per-object mixins of meta-classes. the flag is only used in the mixin-resolver - used for the time being in nx only for Class.info, but would apply as well for methods defined on both Object and Class.