Fix xcfun_get API function

[robertodr]

It was declared to accept an array of doubles, but the pointer type was really only meant as an in-out parameter.

The problem was caught when using it from Fortran (for the C/C++ type system a pointer as an in-out parameter or as an array is the same thing). I have thus edited the example to exercise the xcfun_get function as a test.

The proper solution would be to return the weight, rather than accept it as in-out parameter (with confusing semantics...) This requires rolling back the return for error codes in favor of just quitting on errors. I am working on it in another branch.

I'll mint a v2.0.0a4 as soon as this gets merged.

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Status

• [X] Ready to go

[codecov-io]

Codecov Report

Merging #113 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #113   +/-   ##
=======================================
  Coverage   52.99%   52.99%           
=======================================
  Files          78       78           
  Lines        1970     1970           
=======================================
  Hits         1044     1044           
  Misses        926      926

Impacted Files	Coverage Δ
src/XCFunctional.cpp	65.65% <100%> (ø)	:arrow_up:

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