Remove support of mod2c

[alkino]

See also: BlueBrain/spack#2015 with recipe updates.

To do:

• test GPU wheels (need to build docker image)
• Once PR approved, build official images and update azure yaml
• M1 job:fix sympy handling
• investigate drop in coverage: https://app.codecov.io/gh/neuronsimulator/nrn/pull/2247/indirect-changes

CI_BRANCHES:SPACK_BRANCH=cornu/only_nmodl

[codecov]

Codecov Report

Merging #2247 (a47fc65) into master (beca15a) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2247      +/-   ##
==========================================
- Coverage   58.85%   58.77%   -0.09%     
==========================================
  Files         626      623       -3     
  Lines      119982   119595     -387     
==========================================
- Hits        70613    70289     -324     
+ Misses      49369    49306      -63     

see 11 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[azure-pipelines]

✔️ 1c2e2cb -> Azure artifacts URL

[azure-pipelines]

✔️ 1c2e2cb -> Azure artifacts URL

[bbpbuildbot]

Logfiles from GitLab pipeline #126882 (:white_check_mark:) have been uploaded here!

Status and direct links:

• ✅ mac_m1_cmake_build: [cmake, ON, OFF, OFF, address]
• ✅ spack_setup
• ✅ build:nmodl
• ✅ build:neuron:nmodl:intel:legacy
• ✅ build:neuron:nmodl:intel:shared
• ✅ build:neuron:nmodl:nvhpc:acc:legacy
• ✅ build:neuron:nmodl:nvhpc:acc:shared
• ✅ build:neuron:nmodl:nvhpc:omp:legacy
• ✅ build:neuron:nmodl:nvhpc:omp
• ✅ test:neuron:nmodl:intel:legacy
• ✅ test:neuron:nmodl:intel:shared
• ✅ test:neuron:nmodl:nvhpc:acc:legacy
• ✅ test:neuron:nmodl:nvhpc:acc:shared
• ✅ test:neuron:nmodl:nvhpc:omp:legacy
• ✅ test:neuron:nmodl:nvhpc:omp

[azure-pipelines]

✔️ a47fc65 -> Azure artifacts URL