Update DB to version 18: Machines can have an arbitrary number of memories,

so use an interconnection table, `memory_by_machine`.

cicm_web/Models/MemoryByMachine.cs

@@ -0,0 +1,64 @@
+/******************************************************************************
+// Canary Islands Computer Museum Website
+// ----------------------------------------------------------------------------
+//
+// Filename       : GpuByMachine.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Gpu by machine model
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This program is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as
+//     published by the Free Software Foundation, either version 3 of the
+//     License, or (at your option) any later version.
+//
+//     This program is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//
+//     You should have received a copy of the GNU General Public License
+//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2003-2018 Natalia Portillo
+*******************************************************************************/
+
+using System.Collections.Generic;
+using Cicm.Database.Schemas;
+
+namespace cicm_web.Models
+{
+    public class MemoryByMachine
+    {
+        public MemoryType Type;
+        public MemoryUsage Usage;
+        public long Size;
+        public double Speed;
+
+        public static MemoryByMachine[] GetAllItems(int machineId)
+        {
+            List<Cicm.Database.Schemas.MemoryByMachine> dbItems = null;
+            bool? result =
+                Program.Database?.Operations.GetMemoryByMachine(out dbItems, machineId);
+            if(result == null || result.Value == false || dbItems == null) return null;
+
+            List<MemoryByMachine> items = new List<MemoryByMachine>();
+
+            foreach(Cicm.Database.Schemas.MemoryByMachine dbItem in dbItems)
+                items.Add(new MemoryByMachine
+                {
+                    Type =dbItem.Type,
+                    Usage =dbItem.Usage,
+                    Size =dbItem.Size,
+                    Speed =dbItem.Speed
+                });
+
+            return items.ToArray();
+        }
+    }
+}