threaded discussions on procedure pages

[mooreniemi]

https://github.com/elight/acts_as_commentable_with_threading

[mooreniemi]

[mooreniemi]

http://stackoverflow.com/questions/8737693/self-join-eager-loading-recursively

this is why we havent just made comments commentable, but instead are using the _threading gem. performance is pretty bad though. caching has brought it down to 2000 ms or so

[mooreniemi]

still problematic (app/views/comments/new.js.erb):

$("<%= @parent_id ? "#comment-#{@parent_id} " : '#commentable' %>.reply-target").last().append(
  "<%= escape_javascript(render :partial => 'comments/form', :locals => { :comment => @new_comment }) %>"
).focus();

[mooreniemi]

merged into staging at ecd3207c66a970639f0b11122bbfd8433fa7222e