Newhome

Branch is called "newhome" because all the changes are in support of the new default home page for new wagns (see en.dwagn.org).  Intent is NOT to affect existing wagns.

Key changes:
  1. custom styling for card included on home page named "home+original".
  2. handling for built-in images so that new wagn installs can use the standard file handling with hard-coded images (new default logo, credit image, favicon).  Ie, files are stored in pack/standard/files rather than local/files.  Solution is to add fourth line to raw content of image files.  (changes include bootstrapping for this).
  3. tweaks to default layouts consistent with default layout cards, which moved more of sidebar content (logo, credit) into sidebar card itself.