EXPERIMENTAL: Suppress 'set' events in constructor.

This is a behavior change, but it doesn't break any existing tests and gives a
20% speed improvement on large queries.

This change is not backward compatible, but no existing tests relied on the
old behavior, and I expect there are few or no real-world use cases that want
to be notified of "set" events whenever an object is constructed (including
objects constructed as part of result sets).

src/active_record/main.js

@@ -489,8 +489,7 @@ ActiveRecord = {
                 if(!field.primaryKey)
                 {
                     var value = ActiveRecord.connection.fieldOut(field,this.get(key));
-                    //don't supress notifications on set since these are the processed values
-                    this.set(key,value);
+                    this.set(key,value,true);
                 }
             }
             //performance optimization if no observers