Refactor printing the same text to both stdout and a file

[jwodder]

@yarikoptic Here's your release PR.

[codecov-commenter]

Codecov Report

Merging #376 (fbc0330) into master (24168ba) will increase coverage by 0.56%. The diff coverage is 32.73%.

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@@            Coverage Diff             @@
##           master     #376      +/-   ##
==========================================
+ Coverage   33.87%   34.43%   +0.56%     
==========================================
  Files          51       52       +1     
  Lines        6947     6816     -131     
  Branches     1746     1672      -74     
==========================================
- Hits         2353     2347       -6     
+ Misses       4424     4302     -122     
+ Partials      170      167       -3     

Impacted Files	Coverage Δ
...nidm/experiment/tools/nidm_affinity_propagation.py	0.00% <0.00%> (ø)
.../experiment/tools/nidm_agglomerative_clustering.py	0.00% <0.00%> (ø)
src/nidm/experiment/tools/nidm_gmm.py	0.00% <0.00%> (ø)
src/nidm/experiment/tools/nidm_kmeans.py	0.00% <0.00%> (ø)
src/nidm/experiment/tools/nidm_linreg.py	63.52% <53.03%> (+4.98%)	:arrow_up:
src/nidm/experiment/tools/utils.py	80.00% <80.00%> (ø)

... and 1 file with indirect coverage changes

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[yarikoptic]

Thank you! And looks kosher from the review.

[github-actions[bot]]

:rocket: PR was released in v4.0.0 :rocket: