Remove all trailing blanks; turn on the rule to detect them.

* Makefile.cfg (local-checks-to-skip): Remove sc_trailing_blank.
* .x-sc_trailing_blank: New file, to exempt the few binary files.

tests/create.py

@@ -129,7 +129,7 @@ while i < 30:
         okay = 0
 	t = -1
 	break;
-        
+
     if t == 0:
         break
 

tests/uuid.py

@@ -36,6 +36,6 @@ except:
 if dom2.name() != name0:
     print 'lookup of %s based on UUID brings a different domain %s' % (
            name0, dom2.name())
-     
+
 print "OK"
 sys.exit(0)