- added option "arg=.." to parameter options; this argument can be passed to converter; used currently for "type=relation" to flag, that the relation type is different from the parameter name - extended "objectparameter" to handle such cases - removed relationtypes "mixin", "filter", "instfilter" and "instmixin" since not needed due to converterArg
- moved "-per-object" consequently immediately after obj in the following commands : ::xotcl::alias, ::xotcl::methodproperty, ::xotcl::setter to achiev conformance with ::xotcl::forward and ::xotcl::method