Reverted: 2e099caceb9..21102938e8ccb
I'm going to reapply some of them soon, but it's easier to revert them
all first, as there are conflicts. Also the number of changes that were
inserted since then, mean that there would be a huge gap between related
changes.
- Update iterator_facade test for #1019
(header change already merged).
- Category of each iterator is reduced to a known category before we try to
find a minimum. Fixes#1517.
- `function_input_iterator` from Dean Michael Berris. Fixes#2893
- Fix typo in `boost/iterator.hpp`. Fixes#3434.
- Always include `add_reference` header in iterator adaptor header.
Did not merge changes for #1427.
[SVN r70709]
