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also make_range removed in favor of CTAD, since we are knee deep in
c++17 already.

using template class nesting, which apparently is a big no-no for clang,
and kind of buggy in gcc too until the current trunk... oh well...

with barely a test.

basically ranges::ref_view

also did I really forget the != operator?

no longer uses array ops,
denominator can be a compile time constant.

and conversion ops for range to go along with it,
deprecating the range distance function...

to support promotion, expression templates etc, mainly for geom::vector.
Somehow this didn't break absolutely everything, just rational, which
had to change for the better imo, affected one simple_graphical example.

along with a rangey string view.

and complain in just one place.

which now supports ADL lookup of begin and end functions,
that change happened in previous commit, hidden by the file split.

gotta remember they are public configuration points.

this seed sequence thing in std does not seem like it was very well
thought out... it's basically another prng that is used to seed larger
ons, but it's so cryptic and unwieldy -_-

in general introduced it with vector in mind, to do the masking through
multiplication... though intrinsic vector has an element-wise ternary...
so will need a special mask function here anyway, no need for the
variable.

car is a variable now, not a function,
separated tuple stuff,
tuple_car forwards get<0> better (why even?),
added tuple_tie_cdr (the real reason any of this happened).

still dubious

along with way, wayback, halfway, halfwayback and "improved" average.

with tests stolen from libc++.