More correct summary reporting for relaxed (no size) --annex

[yarikoptic]

See individual commits for more info. Inspired by #7049

• first commit - report at least correct number of annexed files
• 2nd - if relaxed file is present, takes its size from io.stat. But may be we should move that logic into get_content_info or alike?

also thought to tune up bytes2human to not report odd looking float Byte sizes such as 1.0 B instead of 1 B but decided to not bother .

• add changelog when taking out of draft. Want first to agree on the course of action

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (maint@7db210f). Click here to learn what that means.
Patch coverage: 16.66% of modified lines in pull request are covered.

❗ Current head fb377be differs from pull request most recent head 252eb8f. Consider uploading reports for the commit 252eb8f to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##             maint    #7050   +/-   ##
========================================
  Coverage         ?   75.83%           
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  Files            ?      354           
  Lines            ?    58934           
  Branches         ?     6616           
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  Hits             ?    44693           
  Misses           ?    14227           
  Partials         ?       14           

Impacted Files	Coverage Δ
datalad/core/local/status.py	86.72% <16.66%> (ø)

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[bpoldrack]

In principle seems reasonable to me.
Would prefer to not get the size in the renderer, but it's not instantly clear to me where it should go. Unconditionally in get_content_info seems wrong,too, since this could be quite expensive even when this information isn't needed at all.

[yarikoptic]

there were no objections. Indeed renderer might be a suboptimal spot but we agreed on no better one. Adding changelog as promised.

[yarikoptic]

appveyor on mac - unrelated

AILED ../datalad/customremotes/tests/test_archives.py::test_basic_scenario - datalad.runner.exception.CommandError: CommandError: 'git -c diff.ignoreSubmodules=none annex addurl '--file= |;&%b5{}'"'"'"<>Δקم๗あ .dbtc ' 'dl+archive:MD5E-s178--2c93ad202f14e6bfc7c49c281ea99a66.tar.gz#path=+%7C%3B%26%25b5%7B%7D%27%22%3C%3E%CE%94%D7%A7%D9%85%E0%B9%97%E3%81%82+.dbtc+/d/+%7C%3B%26%25b5%7B%7D%27%22%3C%3E%CE%94%D7%A7%D9%85%E0%B9%97%E3%81%82+.datc+' --json --json-error-messages --json-progress -c annex.dotfiles=true' failed with exitcode 139 under /Users/appveyor/DLTMP/datalad_temp_tree_test_basic_scenariorbzzfuki [info keys: stdout_json] [err: 'error: git-annex died of signal 11']

lets' proceed since no objections voiced -- if any comes, submit a PR to remove/redo

[yarikoptic-gitmate]

PR released in 0.18.5