Clean up DriveToCheck class.

ATxCommon/Serializables/DriveToCheck.cs

-using System.Xml.Serialization;
-
-namespace ATxCommon.Serializables
+namespace ATxCommon.Serializables
 {
     /// <summary>
     /// Helper class for the nested SpaceMonitoring sections.
@@ -10,14 +8,11 @@ namespace ATxCommon.Serializables
         /// <summary>
         /// A drive name (single letter followed by a colon, e.g. "D:") to be monitored for space.
         /// </summary>
-        [XmlElement("DriveName")]
         public string DriveName { get; set; }
 
         /// <summary>
         /// Limit (in MB) of free space, lower values will trigger a notification.
         /// </summary>
-        /// Value is to be compared to DriveInfo.TotalFreeSpace, hence the same type (long).
-        [XmlElement("SpaceThreshold")]
         public long SpaceThreshold { get; set; }
     }
 }
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