Site menu improvements

I have improved the site's Top Nav and Actions menus.

• Top Nav is now integrated with the Drupal menu system properly so that it displays the same pretty icons as the rest of the site.
  • Guests see a "Create an account" link first in the menu until they login.
  • Logged in users see a "My account" and "Logout" link on the right instead of hunting below on the sidebar.
  • There's a newly prominent "What's New" link front and center with a cool green radar icon I designed. This makes it easy to see all the latest content on every part of the site in one list.
  • The forum has a prominent link on the top to make it easy for people to go there and discuss.
• The Actions menu now includes clearly labeled links to create all our major content types with a shiny icon for each one.
• The action menu's nonmenclature distinguishes between "Document a medium/audience/idea/skill" for collaborative writing to reach objective explanations of shared subjects, "Post a topic/link/entry/event" for personal writing and "Start a campaign/group" for launching collaborative undertakings.