Added some tunes to node type creation settings.
Wrote ed_news module uninstall code.

As ed_news node type got changed a bit and it is not possibly to remove that
using the administration interface, uninstall method had to be changed
to remove all created ed_news type of nodes and remove the node itself.
There is a probability that hook_enable and hook_disable need to be used
to enable/diable ed_news node type when module is enabled_disabled.
Added news listing page. Added that to main-menu.

Created a news listing page that has the looks more or less like the
prototype image (item views are not as they should be; using default
ones). Added that page into main-menu at a position of 2. All the other
elements of the menu will be added by other modules.
Added a missing heading.
Simplified ed_news node removal on uninstall.