(swig) Removed inheriting boost::noncopyable from Wccl::Expression

swig/libcclexpression.i

@@ -11,7 +11,7 @@
 %include "std_string.i"
 
 namespace Wccl {
-  class Expression : boost::noncopyable {
+  class Expression {
   public:
     virtual std::string to_string(const Corpus2::Tagset& tagset) const = 0;
     std::string to_raw_string() const;