Add support of comments in .calculate_directory files

calculate/lib/cl_template.py

@@ -4205,7 +4205,11 @@ re.M|re.S)
                 return (applyDir, True, crDirs)
         try:
             FD = open(templateDirFile)
-            textTemplate = FD.readline()
+            textTemplate = FD.readline().rstrip()
+            buf = textTemplate
+            while buf and textTemplate.endswith('\\'):
+                buf = FD.readline()
+                textTemplate = "%s %s"%(textTemplate[:-1],buf.rstrip())
             FD.close()
         except:
             self.setError(_("Failed to open the template") + ": " +\