InputOutputCurve function evaluation

[luke-kiernan]

Implement (ioc::InputOutputCurve)(x::Real) by evaluating ioc's function data at x. (This gives me a clean way to calculate the power loss in a HVDC line in PowerFlows.jl.) Also fix a copy-paste error and only enforce bounds up to FP precision.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.28%. Comparing base (0ee9770) to head (69859fd).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #517      +/-   ##
==========================================
+ Coverage   79.10%   80.28%   +1.18%     
==========================================
  Files          71       71              
  Lines        6192     6103      -89     
==========================================
+ Hits         4898     4900       +2     
+ Misses       1294     1203      -91     

Flag	Coverage Δ
unittests	80.28% <100.00%> (+1.18%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/function_data.jl	99.56% <100.00%> (+1.30%)	⬆️
src/value_curve.jl	93.06% <100.00%> (+1.89%)	⬆️

... and 28 files with indirect coverage changes

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[GabrielKS]

LGTM, thanks!