Build_generator will add the redfam_talkpages_generator to the
genFactory, build a generator of the genFactory and sets self.gen
which is used as generator for run()
Related Task: [https://fs.golderweb.de/index.php?do=details&task_id=88 FS#88]
We need a wrapper around redfam.article_generator to pass it to
pagegenerators.PageWithTalkPageGenerator and to add a reference to
related redfam to each pywikibot.page-object before yielding it
Related Task: [https://fs.golderweb.de/index.php?do=details&task_id=88 FS#88]