Updated sessions feature

I see duplicate "my session" menu links with this update, one of which goes to the admin view.

Actually, looks like those dupes are already present before this patch.
With the patch a lot of the views having missing handlers, probably from DCCO cck fields that aren't present. I'm taking a look at which ones of those we might like to package :).

Wanted to note here that it would be nice to do a hook_requirements check for the available options on fields like 'time slot' and other session fields which vary from event to event, to remind admins to populate these fields,

Here's a pretty large patch that includes the following:

- Changed "sessions" to "submitted sessions" in menu link for consistency
- Empty text for submitted sessions view
- Consolidated all per-user session agenda views (block, user/x/agenda) to the my_schedule view

The following fieldsets are now part of the session content type:

Schedule -- restricted by cck field perms to the new "session organizer" role.
- Day
- Timeslot
- Room

Audience info
- Track
- Skill Level

I committed this slightly tweaked version that moves the proposed sessions view into the primary links.

Let's continue with other tweaks in new issues. Thanks!