Refs #7775. Fixing timestamps.

Code/Mantid/instrument/CNCS_Definition.xml

 <?xml version='1.0' encoding='ASCII'?>
-<instrument last-modified="2013-08-19 10:32:00.601412" valid-to="2100-01-31 23:59:59" name="CNCS" valid-from="2013-08-14 14:30:00">
+<instrument last-modified="2013-08-19 14:15:20.720735" valid-to="2100-01-31 23:59:59" name="CNCS" valid-from="2013-08-14 18:30:00">
   <!--Created by Michael Reuter-->
   <defaults>
     <length unit="metre"/>

Code/Mantid/instrument/CNCS_Definition_20120817_20130814.xml

 <?xml version='1.0' encoding='ASCII'?>
-<instrument valid-to="2013-08-14 14:00:00" name="CNCS" valid-from="2012-08-17 00:00:01" last-modified="2013-08-19 10:23:00">
+<instrument valid-to="2013-08-14 18:00:00" name="CNCS" valid-from="2012-08-17 00:00:01" last-modified="2013-08-19 10:23:00">
   <!-- for 17th August 2012 onwards -->
   <defaults>
     <length unit="metre"/>