Make std::forward_list iterator operators inline friend

[François Dumont]

Same patch as for std::list iterators. I only additionally move doc on 
those operators.

I also avoid redefining some typedef that are already defined in 
_Fwd_list_base<>.

 Â Â Â  * include/bits/forward_list.h
 Â Â Â  (_Fwd_list_iterator<>::operator==): Replace member function with inline
 Â Â Â  friend.
 Â Â Â  (_Fwd_list_iterator<>::operator!=): Likewise.
 Â Â Â  (_Fwd_list_const_iterator<>::operator==): Likewise.
 Â Â Â  (_Fwd_list_const_iterator<>::operator!=): Likewise.
 Â Â Â  (operator==(const _Fwd_list_iterator<>&,
 Â Â Â  const _Fwd_list_const_iterator<>&)): Remove.
 Â Â Â  (operator!=(const _Fwd_list_iterator<>&,
 Â Â Â  const _Fwd_list_const_iterator<>&)): Remove.
 Â Â Â  (forward_list<>::_Node): Take typedef from base type.
 Â Â Â  (forward_list<>::iterator): Likewise.
 Â Â Â  (forward_list<>::const_iterator): Likewise.

Tested under Linux x86_64.

Ok to commit ?

François

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