Backports fix for FullpathToRoot in GlobalSettings... not sure how some unit tests have been working this whole time.

Changes UseLegacySchema default value to false... was set to true!?
un-ignores LookupByNiceUrl tests and still ensures it doesn't require a database to test by passing in an optional parameter
to LookupByNiceUrl to specify if we want to include domain lookups or not (default is true)

src/Umbraco.Core/Configuration/GlobalSettings.cs

@@ -221,7 +221,7 @@ namespace Umbraco.Core.Configuration
         /// <value>The fullpath to root.</value>
         public static string FullpathToRoot
         {
-            get { return HttpRuntime.AppDomainAppPath; }
+            get { return IOHelper.GetRootDirectorySafe(); }
         }
 
         /// <summary>

src/Umbraco.Core/Configuration/UmbracoSettings.cs

@@ -1062,7 +1062,7 @@ namespace Umbraco.Core.Configuration
 			get
 			{
                 // default: true
-                return _useLegacySchema ?? GetKeyValue("/settings/content/UseLegacyXmlSchema", true);
+                return _useLegacySchema ?? GetKeyValue("/settings/content/UseLegacyXmlSchema", false);
 			}
 			internal set
 			{