Cleaned up the table trimming methods. Group creation now proper marks rows as dirty when row attribute changes. Projections table processes successfully on the new modify record form.

AdvertsingProfitControl/DbTableWriterStatus.cs

@@ -44,7 +44,9 @@ namespace AdvertsingProfitControl
         {
             _rowIds.Remove(key);
         }
-
+        /// <summary>
+        /// Clears the collection of row IDs.
+        /// </summary>
         public void ClearRowCollection()
         {
             _rowIds.Clear();
@@ -72,7 +74,7 @@ namespace AdvertsingProfitControl
         /// Gets any error message set by the Insertion/Update operation function.
         /// If none are set returns an empty string.
         /// </summary>
-        /// <returns>The error message.</returns>
+        /// <returns>The error message, string.Empty if no message is set.</returns>
         public string GetErrorMessage()
         {
             //If the error message is null then return string.Empty.