adjust code and tests to changes in Nemo.jl

[ThomasBreuer]

addresses the failures that happen in #965

[codecov]

Codecov Report

Merging #966 (c818224) into master (ae2997e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head c818224 differs from pull request most recent head 6c2f7c1. Consider uploading reports for the commit 6c2f7c1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #966      +/-   ##
==========================================
+ Coverage   75.80%   75.83%   +0.02%     
==========================================
  Files          51       51              
  Lines        4187     4183       -4     
==========================================
- Hits         3174     3172       -2     
+ Misses       1013     1011       -2     

Files	Coverage Δ
pkg/JuliaExperimental/gap/zmodnz.g	97.77% <100.00%> (ø)

... and 1 file with indirect coverage changes

[ThomasBreuer]

There were funny failures in the GAP tests:
The file pkg/JuliaInterface/tst/wrapper.tst contains the lines

gap> N(1);
Error, MethodError: objects of type BigInt are not callable

where N is a Julia object of the type BigInt. This test used to pass.

Now we get failures in the two tests Julia nightly - ubuntu-latest and Julia nightly - macOS-latest.
The expected output is

Error, MethodError: objects of type BigInt are not callable
The object of type `BigInt` exists, but no method is defined for this combinat\
\
ion of argument types when trying to treat it as a callable object.
Maybe you forgot to use an operator such as *, ^, %, / etc. ?

Surprisingly, I can reproduce the failure locally with Julia 1.8.5.
(So shouldn't the problem have occurred much earlier?)

Locally, I can make the test pass by prescribing one more output line
from the several lines of the error message:

Error, MethodError: objects of type BigInt are not callable
Maybe you forgot to use an operator such as *, ^, %, / etc. ?

I have now pushed this change. Let us see what the CI test results are.

[ThomasBreuer]

After my second commit, things are getting even more funny:
The changes from this commit affect just the test file pkg/JuliaInterface/tst/wrapper.tst.
Now (among others) the test Julia 1.6 - ubuntu-latest fails, which had passed before the second commit, and reports problems in the test file pkg/JuliaExperimental/tst/realcyc.tst.
What is going on here?