[Boost.Graph] Survey: minimum C++ standard for Boost.Graph going forward

Dear Boost Community,

During the Boost Graph Modernization Workshop in Paris co-organized with
Jeremy Murphy (BGL principal maintainer), one of the most frequent
discussion points was the C++ standard version the Boost Graph Library
should require.

Some context worth knowing:
- Boost.Graph is already C++14
- A lot of API modernization can be done without bumping the minimum.
- Some modernization changes would land cleaner on a newer standard
- We don't yet have a clear enough picture of our users' constraint space
to inform our discussion about a potential baseline bump. For example, it
appeared that automotive industry users will be locked in C++17 for a while
with MISRA.

Consequently we want to ask Boost.Graph users:

What's the oldest C++ standard your project needs BGL to keep supporting
(i.e. the version past which a bump would break you or force you to pin a
version).

Answers: C++14 / 17 / 20 / 23.

You can answer:
- with this simple Github survey:
https://github.com/boostorg/graph/discussions/490
- on this reddit poll:
https://www.reddit.com/r/cpp/comments/1tc1v6x/comment/olproye/
- or on this thread

Also please indicate if you’re a BGL active user or an observer eager to
give feedback (both are welcome!)

Thank you for your time :D
Arnaud
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