use select form to configure time zone; move configuration page alongside migrate configuration page

Require that all languages in use on sf-active site be setup on Drupal site; attach orphan comments to first article; use new json-method for adding date fields.

create new class of columns, markup columns, which may contain HTML and thus have limited entity decoding.

some fixes for istanbul: don't migrate parent (which may be empty string) and remove html entities from feature title