[v3] Fix allocator-aware container requirements for forward_list

[Jonathan Wakely]

This fixes the new LWG issue 2210 and only uses allocator::construct()
for the elements not the nodes.

2012-11-02  Jonathan Wakely  <jwakely.gcc@gmail.com>

        * include/bits/forward_list.h (forward_list(size_type)): Add missing
        allocator parameter.
        (_Fwd_list_node_base): Use NSDMI and define constructor as defaulted.
        (_Fwd_list_node::_M_value): Replace with uninitialized storage.
        (_Fwd_list_node::_M_valptr()): Define functions to access storage.
        (_Fwd_list_iterator, _Fwd_list_const_iterator): Use _M_valptr.
        (_Fwd_list_base::_M_create_node): Only use allocator to construct the
        element not the node.
        * include/bits/forward_list.tcc (_Fwd_list_base::_M_erase_after): Only
        use allocator to destroy the element not the node.
        * testsuite/23_containers/forward_list/cons/11.cc: Remove unused
        headers.
        * testsuite/23_containers/forward_list/cons/12.cc: Likewise.
        * testsuite/23_containers/forward_list/cons/13.cc: New.
        * testsuite/23_containers/forward_list/cons/14.cc: New.

Tested x86_64-linux, committed to trunk.

The pretty printers need an update, which I'll do asap.
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