remove accidental c++11 dependency

Description

Removing the accidental c++11 dependency. By using the explicit double min/max values. This is exactly the same behaviour as before, c.f. https://en.cppreference.com/w/cpp/types/numeric_limits/lowest

Additional Checklist Items

• I have updated documentation as needed: not needed
• I considered if this should be cherry-picked/ported somewhere else (rel-2-x or master), and if yes, opened a corresponding issue or MR: not needed

changed milestone to %rel-2-2-15

added build-system minor labels

requested review from @ebothmann and @fsiegert

assigned to @max.knobbe

mentioned in issue #486 (closed)

Looks perfect. Since it's release, I also read the cppreference documentation you refer to, and your change should indeed give the exact same behaviour as before.

However, I would put the #include <cfloat> into the .C file, such that not all files including the .H also have to include that <cfloat> header.

That's just good practice to keep compilation times snappy.

added 1 commit

• 3188d84e - move cfloat include to header file

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