Move random to src/gnu

[alkino]

This patch move most of the code that is not hoc to the directory gnu.

In the future this directory will be cleaned to remove gnu stuff and renamed something like 'src/random'.

This way nrn will have an external random library, and a clean hoc_interface.

This patch move Isaac, MCellRan4, Random123, Rand.

[github-actions]

Unable to retrieve AZURE drop url from comments!

[azure-pipelines]

✔️ 7e94c47 -> Azure artifacts URL

[github-actions]

NEURON ModelDB CI: launching for 7e94c47 via its drop url

[azure-pipelines]

✔️ 756d18e -> Azure artifacts URL

[github-actions]

NEURON ModelDB CI: 7e94c47 -> download reports from here

[sonarcloud]

Quality Gate failed

Failed conditions

C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[codecov]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Comparison is base (f64b609) 66.32% compared to head (c57bbe4) 66.29%.

Files	Patch %	Lines
src/oc/oc_mcran4.cpp	39.28%	17 Missing ⚠️
src/ivoc/ivocrand.cpp	0.00%	13 Missing ⚠️
src/gnu/NrnRandom123RNG.hpp	61.53%	5 Missing ⚠️
src/gnu/Isaac64RNG.hpp	0.00%	2 Missing ⚠️
src/oc/scoprand.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2689      +/-   ##
==========================================
- Coverage   66.32%   66.29%   -0.04%     
==========================================
  Files         559      558       -1     
  Lines      108657   108431     -226     
==========================================
- Hits        72071    71886     -185     
+ Misses      36586    36545      -41     

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[bbpbuildbot]

Logfiles from GitLab pipeline #188550 (: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

[github-actions]

NEURON ModelDB CI: launching for 756d18e via its drop url

[azure-pipelines]

✔️ c57bbe4 -> Azure artifacts URL

[github-actions]

NEURON ModelDB CI: 756d18e -> download reports from here

[alkino]

nrn-modeldb-ci got no differences at all

[pramodk]

LGTM! thanks @alkino !