Reduced duplicated Audits

Added comments
Added and used calculated IsDirty Property

PROMS/Volian.Controls.Library/StepRTB.cs

@@ -2876,10 +2876,14 @@ namespace Volian.Controls.Library
 					{
 						rousg = itm.MyContent.ContentRoUsages.Add(roparts[1], rodb);
 					}
+					//get temporary rousageid
 					oldid = rousg.ROUsageID;
 					Rtf = Rtf.Replace("<NewID>", string.Format("<CROUSGID={0}>", rousg.ROUsageID));
+					//save temporary rousageid to get real rousageid
 					itm.Save();
+					//replace temprorary rousageid with real rousageid
 					Rtf = Rtf.Replace(string.Format("<CROUSGID={0}>", oldid), rousg.ROUsageID.ToString());
+					//save real rousageid
 					itm.Save();
 					MyItemInfo.MyContent.RefreshContentRoUsages();
 				}