python::list iterator support

[Arnaldur Gylfason]

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Hi

I have added iterator support for list.
Here is the code (list_iter.hpp) (See attached file: list_iter.hpp)
It has just the additions. All previous stuff in list has been deleted.
Add this to objects.hpp.
I have tested it using:

     python::ref test_listiter()
     {
          python::list mylist;
          for(int i = 0;i < 10;++i)
               mylist.append(i);

          int sum = 0;
          for(python::list::iterator it = mylist.begin();it != mylist.end
();++it)
          {
               sum += static_cast<int>(*it);
          }

          //cout << typeid(python::list::iterator::reference).name();

          cout << "Sum: " << sum;

          for(python::list::iterator it = mylist.begin();it != mylist.end
();++it)
          {
               *it = static_cast<int>(*it)*10;
          }

          return mylist;

     }

which worked correctly.

When number has been added, it will be easier to use.
(e.g. could not use std::accumulate. Would have to explicitly type cast
it.)
Will work on that later.

Note. If operator[]  returns iterator_proxy it will probably be a bit
faster.

Cheers

Arnaldur


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