atanh skeleton impl and test

[ckormanyos]

No description provided.

[ckormanyos]

This one still needs tests of edge cases, small argument and of course to reach $100$ percent coverage in the atanh() implementation.

[ckormanyos]

Hi Matt (@mborland) new in today's lineup is the bare-metal CI run, which checks code size and functionality as discussed in another thread. If you get a chance, could you please add the QEMU metal run to the required runs in branch-protection? See image below for naming.

[codecov]

Codecov Report

Merging #330 (952c096) into develop (422e385) will increase coverage by 0.1%.
The diff coverage is 100.0%.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #330     +/-   ##
=========================================
+ Coverage     97.7%   97.7%   +0.1%     
=========================================
  Files           72      73      +1     
  Lines         3275    3295     +20     
=========================================
+ Hits          3199    3219     +20     
  Misses          76      76             

Files	Coverage Δ
include/boost/decimal/cmath.hpp	100.0% <ø> (ø)
include/boost/decimal/detail/cmath/asinh.hpp	100.0% <ø> (ø)
include/boost/decimal/detail/cmath/atanh.hpp	100.0% <100.0%> (ø)

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[mborland]

Hi Matt (@mborland) new in today's lineup is the bare-metal CI run, which checks code size and functionality as discussed in another thread. If you get a chance, could you please add the QEMU metal run to the required runs in branch-protection? See image below for naming.

Done

[ckormanyos]

CI failing also resulting from Math 1052.