Show scores in outputs of suggest, eval and index with 4 decimals

[juhoinkinen]

Currently the output of annif suggest (to stdout) and annif index (to document.annif file) is e.g. as follows:

<http://www.yso.fi/onto/yso/p109998>	Röyttä (Ii)	0.4971785247325897
<http://www.yso.fi/onto/yso/p38304>	stabiilius (muuttumattomuus)	0.4472784399986267
<http://www.yso.fi/onto/yso/p10546>	hydrodynamiikka	0.4472784399986267
<http://www.yso.fi/onto/yso/p2048>	jääliikenne	0.44725048542022705
<http://www.yso.fi/onto/yso/p4911>	laivat	0.42701175808906555
<http://www.yso.fi/onto/yso/p12284>	hinaajat	0.40847617387771606
<http://www.yso.fi/onto/yso/p19211>	hydrostatiikka	0.3946342170238495
<http://www.yso.fi/onto/yso/p17953>	rahtilaivat	0.37881672382354736
<http://www.yso.fi/onto/yso/p16317>	höyrylaivat	0.36528536677360535
<http://www.yso.fi/onto/yso/p3976>	koneistot	0.3235071897506714

And the output of annif eval:

Precision (doc avg):          	0.12500000000000003
Recall (doc avg):             	0.2593537414965987
F1 score (doc avg):           	0.16722522342270243
Precision (subj avg):         	0.0006919161493665802
Recall (subj avg):            	0.0005637320849872252
F1 score (subj avg):          	0.00058845613207959
Precision (weighted subj avg):	0.42108585858585856
Recall (weighted subj avg):   	0.26515151515151514
F1 score (weighted subj avg): 	0.3055555555555555
Precision (microavg):         	0.125
Recall (microavg):            	0.26515151515151514
F1 score (microavg):          	0.16990291262135923
F1@5:                         	0.17080142080142083
NDCG:                         	0.23108215630054474
NDCG@5:                       	0.19264987111091614
NDCG@10:                      	0.23108215630054474
Precision@1:                  	0.21428571428571427
Precision@3:                  	0.21428571428571425
Precision@5:                  	0.17142857142857149
True positives:               	35
False positives:              	245
False negatives:              	97
Documents evaluated:          	28

The very many decimals make reading the outputs a bit hard, but they don't offer any significant value.

This PR makes the shown scores to be rounded to 4 decimal places.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (2d1d3ce) 99.66% compared to head (ada1419) 99.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #704   +/-   ##
=======================================
  Coverage   99.66%   99.66%           
=======================================
  Files          89       89           
  Lines        6288     6293    +5     
=======================================
+ Hits         6267     6272    +5     
  Misses         21       21           

Impacted Files	Coverage Δ
annif/cli.py	100.00% <100.00%> (ø)
annif/cli_util.py	99.00% <100.00%> (+0.01%)	⬆️
tests/test_cli.py	100.00% <100.00%> (ø)

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[osma]

I tested this. LGTM.