added UI for kdb support

fixed issue with not keeping "meta stream entries" (database color, default username) and num encryption rounds
fixed issues with recycle bin (wasn't updating group list correctly, couldn't access newly created recycle bin group)

src/KeePassLib2Android/IDatabaseFormat.cs

@@ -15,5 +15,13 @@ namespace KeePassLib
 		void Save(PwDatabase kpDatabase, Stream stream);
 
 		bool CanHaveEntriesInRootGroup { get; }
+		bool CanHaveMultipleAttachments { get;  }
+		bool CanHaveCustomFields { get;  }
+		bool HasDefaultUsername { get; }
+		bool HasDatabaseName { get; }
+		bool SupportsAttachmentKeys { get;  }
+		bool SupportsTags { get; }
+		bool SupportsOverrideUrl { get; }
+		bool CanRecycle { get; }
 	}
 }

src/KeePassLib2Android/PwDatabase.cs

@@ -426,11 +426,13 @@ namespace KeePassLib
 		public byte[] HashOfFileOnDisk
 		{
 			get { return m_pbHashOfFileOnDisk; }
+			set { m_pbHashOfFileOnDisk = value; }
 		}
 
 		public byte[] HashOfLastIO
 		{
 			get { return m_pbHashOfLastIO; }
+			set { m_pbHashOfLastIO = value; }
 		}
 
 		public bool UseFileTransactions