rem: virtual KNHeaders::Newsgroups* newsgroups(bool create=true)      { KNHeaders::Newsgroups *p=0; return getHeaderInstance(p, create); }
add: KNHeaders::Newsgroups* newsgroups(bool create=true)     { if( (!create && n_ewsgroups.isEmpty()) || (!create && !doPost()) ) return 0; return &n_ewsgroups; }
context:    	virtual KNHeaders::Newsgroups* newsgroups(bool create=true)      { KNHeaders::Newsgroups *p=0; return getHeaderInstance(p, create); }