Use a pythonic "SED" and fix some unknown exception

[tbridel]

Hi there @sshiraiwa ! 👋

Sorry it has been a while.
I am just putting this MR up for review because I just realized it was left in my repo and I never pushed it here.

Basically ...

• I removed the need for a proper sed install: on Debian, RHEL, Darwin, etc... they are all different and they do not behave like we except most of the time, so I wanted to use pure python code.
• I fixed a typo (?) in the latest version of the numba_coefficients.i template file. It turns out BaseError does not exist in the standard python distribution.

Tell me what you think !
Cheers !

[tbridel]

The pipeline looks good @sshiraiwa.

A couple examples failed to run but after checking other recent pipelines it seems it's a common symptom. Could some of those parallel tests be flaky ? I cannot restart the pipeline to check if it's a deterministic behavior unfortunately.

[sshiraiwa]

Hi @tbridel . I agree that the pipellne looks good. The errors are happening when comparing the output files produced by ex29p and ex29p.py This has been happening in recent tests and I haven't figured out what is going on. I don't think, however, this is not a big problem because,

1. the difference of output file is very small. Only 69 lines out of >1000 lines.
2. I can not reproduce this when I run it locally using a docker
3. All other examples do not have this symptom.

Contents does not agree:  flux.000000
# 69 lines do not agree out of 3680
Contents does not agree:  flux.000001
# 59 lines do not agree out of 3680
ex29p  FAIL

[sshiraiwa]

Merging this. Thank you for the contribution