Cleanup (indentation, comments) for non-const global support

@Zoomulator - I pulled in your non-const global commits.

include/chaiscript/dispatchkit/dispatchkit.hpp

@@ -478,6 +478,9 @@ namespace chaiscript
         }
 
 
+        /**
+         * Adds a new global (non-const) shared object, between all the threads
+         */
         void add_global(const Boxed_Value &obj, const std::string &name)
         {
           validate_object_name(name);

include/chaiscript/language/chaiscript_engine.hpp

@@ -454,6 +454,11 @@ namespace chaiscript
       return *this;
     }
 
+    /// \brief Adds a mutable object that is available in all contexts and to all threads
+    /// \param[in] t_bv Boxed_Value to add as a global
+    /// \param[in] t_name Name of the value to add
+    /// \warning The user is responsible for making sure the object is thread-safe if necessary
+    ///          ChaiScript is thread-safe but provides no threading locking mechanism to the script
     ChaiScript &add_global(const Boxed_Value &t_bv, const std::string &t_name)
     {
       m_engine.add_global(t_bv, t_name);