added better db migration support than what Subsonic provides out of the box.

Migrator.net/Migrator.Framework/ColumnProperty.cs

@@ -0,0 +1,50 @@
+using System;
+
+namespace Migrator.Framework
+{    
+    
+    /// <summary>
+    /// Represents a table column properties.
+    /// </summary>
+    [Flags]
+    public enum ColumnProperty
+    {
+        None = 0,
+        /// <summary>
+        /// Null is allowable
+        /// </summary>
+        Null = 1,
+        /// <summary>
+        /// Null is not allowable
+        /// </summary>
+        NotNull = 2,
+        /// <summary>
+        /// Identity column, autoinc
+        /// </summary>
+        Identity = 4,
+        /// <summary>
+        /// Unique Column
+        /// </summary>
+        Unique = 8,
+        /// <summary>
+        /// Indexed Column
+        /// </summary>
+        Indexed = 16,
+        /// <summary>
+        /// Unsigned Column
+        /// </summary>
+        Unsigned = 32,
+        /// <summary>
+        /// Foreign Key
+        /// </summary>
+        ForeignKey = Unsigned | Null,
+        /// <summary>
+        /// Primary Key
+        /// </summary>
+        PrimaryKey = 64 | Unsigned | NotNull,
+        /// <summary>
+        /// Primary key. Make the column a PrimaryKey and unsigned
+        /// </summary>
+        PrimaryKeyWithIdentity = PrimaryKey | Identity
+    }
+}