Hide move_iterator ill-form operators

[François Dumont]

Hi

 Â Â Â  This is another attempt to make adapter iterator types operators 
undefined when underlying iterator type doesn't support it. For the 
move_iterator it is rather easy and even already done for the operator- 
so I just generalize it to comparison operators. It doesn't cover all 
operators of course but it is still better than current situation.

 Â Â Â  * include/bits/stl_iterator.h (move_iterator<>::operator++(int)):
 Â Â Â  Simplify implementation using underlying iterator type same
 Â Â Â  post-increment operator.
 Â Â Â  (move_iterator<>::operator--(int)):
 Â Â Â  Simplify implementation using underlying iterator type same
 Â Â Â  post-decrement operator.
 Â Â Â  (move_iterator<>::operator<(const move_iterator<>&,
 Â Â Â  const move_iterator<>&): Define return type as return type of the same
 Â Â Â  expression on underlying iterator type.
 Â Â Â  (move_iterator<>::operator<=(const move_iterator<>&,
 Â Â Â  const move_iterator<>&): Likewise.
 Â Â Â  (move_iterator<>::operator>(const move_iterator<>&,
 Â Â Â  const move_iterator<>&): Likewise.
 Â Â Â  (move_iterator<>::operator>=(const move_iterator<>&,
 Â Â Â  const move_iterator<>&): Likewise.
 Â Â Â  * testsuite/24_iterators/move_iterator/operator_neg.cc: New.

 Â Â Â  Ok to commit or should the Standard be amended first ?

François
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