* Presta.csproj: A first class

* AssemblyInfo.cs: initial commit

* NpgsqlCircleProvider.cs: circle members are now stored in bd upon
  their user's name

* InputCircle.cs: fixes the new CircleManager interface usage

* Yavsc.sln: Adds the `Presta` project

* CircleController.cs: * Authorize some Http methods
* Lists circles as circles

* style.css: Fixes the missing "hidden" css class

* AccountController.cs: using the new Circle provider interface

* BlogsController.cs: * using the new Circle provider interface
* do not test blog entry collections in order to group them by a
  unique user name or title, it's too bad,
instead, keep user's request id as guide to model and view.

* YavscHelpers.cs: Adds a Circle Html formatter

* Circles.aspx: List of circles is now given as a list of `Circle`
  objects

* instdbws.sql: fixes the db in order to store user names in circle
  member's records.

* BlogEntryCollection.cs: ConcernsAUniqueTitle and ConcernsAUniqueUser
  are now Obsoletes

* UUTBlogEntryCollection.cs: Drops a useless ctor

* CircleProvider.cs: The `CircleManager` now delivers the user's
  circle as a `Circle` object collection.

yavscModel/Circles/CircleProvider.cs

@@ -72,7 +72,7 @@ namespace Yavsc.Model.Circles
 		/// <summary>
 		/// List this instance.
 		/// </summary>
-		public abstract IEnumerable<ListItem> List(string user);
+		public abstract IEnumerable<Circle> List(string user);
 
 		/// <summary>
 		/// Covers the specified username.