ParallelContext: hoc_ac_ encodes global id of submitted process. (#2965)

[nrnhines]

Third try's the charm. Cherry-pick from master 6069a3a See #2965

tested with

nrniv src/parallel/test6.hoc third from last line of output is

id=19 Test[1]: 361 = f(19, "goodbye", Vector[19])

[sonarcloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[azure-pipelines[bot]]

✔️ a4e5482851c34f6fc94504125ab57068894fd76a -> Azure artifacts URL