Feature summary (what you would like to be able to do and where):

• If the PageImages extension is enabled, the ProofreadPage extension should:
  • In the Page namespace: Set the current scanned page's image as the PageImage for that page
  • In the Index namespace: Set the first image of the file as the PageImage for the index page
  • Make the <pages> tag set the image for the first relevant page as the page image for the page where the tag is used

Benefits (why should this be implemented?):

• Add useful thumbnails to Wikisource on-wiki search results