Bugfix for linking

[torfjelde]

Fixes part of the issues discussed in #504.

It turns out we forgot to add the test/linking.jl to test/runtests.jl so we haven't been testing the linking properly 🤦 This is also fixed here.

[github-actions]

Pull Request Test Coverage Report for Build 5770940094

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.7%) to 76.221%

---

Totals
Change from base Build 5765768895:	0.7%
Covered Lines:	2106
Relevant Lines:	2763

---

💛 - Coveralls

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.72% 🎉

Comparison is base (aa13dcf) 75.49% compared to head (3528200) 76.22%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #513      +/-   ##
==========================================
+ Coverage   75.49%   76.22%   +0.72%     
==========================================
  Files          23       23              
  Lines        2763     2763              
==========================================
+ Hits         2086     2106      +20     
+ Misses        677      657      -20     

Files Changed	Coverage Δ
src/varinfo.jl	81.10% <100.00%> (+3.29%)	⬆️

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[torfjelde]

@yebai @devmotion could one of you have a look at this?:) Should be a fairly quick merge I believe.

EDIT: Though I realize it's a weekend, so np if unavailable!

[devmotion]

Looks good, only some minor comments. Feel free to merge once they are addressed 🙂