only Firefox seems to make the placeholder text
be the same color as the normal text, so this will
set the placeholder to a lighter grey

fixes #2187

* Slide the password fields down whenever they are shown.
* Add slideUp/slideDown, fadeIn/fadeOut to dom-jquery.js

Generalize error-display to extended-info.  For every "screen" that is shown, create an extendedInfo and instantiate it.  Remove the "error-display.show" code that was in page_helpers and page_module.

issue #1916

common/
      js
      css
      i

dialog/
      js
      css
      i

pages/
      js
      css
      i