Rename parameters from "nworkers" to "num-threads"

[albestro]

As per discussion in the last meeting, we are doing this breaking change on parameter names:

• dlaf:red2band-panel-nworkers becomes dlaf:red2band-panel-num-threads
• dlaf:tridiag-rank1-nworkers becomes dlaf:tridiag-rank1-num-threads

This change applies also to related environment variables names.

[RMeli]

Wouldn't be better if the get_* functions are called in the same way as the parameter (e.g. get_red2band_panel_num_threads instead of get_red2band_panel_num_workers)?

[albestro]

Wouldn't be better if the get_* functions are called in the same way as the parameter (e.g. get_red2band_panel_num_threads instead of get_red2band_panel_num_workers)?

I thought about that (and with that also the variables): my opinion is that algorithmically makes sense (to me) that I consider them "workers" independently from the backend, i.e. being them threads or streams.

[rasolca]

cscs-ci run

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.07%. Comparing base (47a58ea) to head (1fb2cd3).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/tune.cpp	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1270   +/-   ##
=======================================
  Coverage   95.07%   95.07%           
=======================================
  Files         141      141           
  Lines        8655     8655           
  Branches     1110     1110           
=======================================
  Hits         8229     8229           
  Misses        239      239           
  Partials      187      187           

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