namesapce bit and new functions
iterator::counting_iterator<>
fixing bug for `constexpr falcon::cstring cs("plop")`
cstring is now compatible C++89
adding manipulators functors
rename foreach2 to for_each2
new iterator: iterator_iterator<>
rename ostream/ostream_insert.hpp to ostream/insert.hpp
add iterator_iterator.hpp, multibuf, fmstream and various improvements