[development] new feature: comment settings now per node type

[Chad Phillips -- Apartment Lines]

in order to greatly improve the usability of project module on  
drupal.org in Drupal 6, we snuck this feature in today...  ;)

it's a nice new end user feature which also cleans up the UI --  
developer impact is minimal, and detailed here:

http://drupal.org/node/114774#comment_settings_per_node_type

hunmonk