Check if JuliaInterface could be loaded

[sebasguts]

when GAP is loaded into Julia

[codecov]

Codecov Report

Merging #191 into master will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
- Coverage   67.63%   67.63%   -0.01%     
==========================================
  Files          43       43              
  Lines        2299     2302       +3     
==========================================
+ Hits         1555     1557       +2     
- Misses        744      745       +1

Impacted Files	Coverage Δ
LibGAP.jl/src/initialization.jl	86.66% <66.66%> (-2.23%)	⬇️

[fingolfin]

Assuming that you have tested it (e.g. by manually removing / unsetting _JULIAINTERNAL_JULIAINTERFACE_LOADED to provoke a failure), this seems plausible enough.

[sebasguts]

I did indeed. Also, I was reluctant to create a testcase, as the most sensible way is to move the package away.