Use the latest file in multifile items

[Xarthisius]

For WT proper it's a noop. In general it allows to have more than one file object dangling of item. Intended use is a poor-man's versioning of items.

[codecov]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (437313b) 77.03% compared to head (e65452e) 77.13%.

Files	Patch %	Lines
server/lib/transfer_manager.py	55.55%	16 Missing ⚠️
server/lib/utils.py	77.77%	2 Missing ⚠️
server/resources/fs.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
+ Coverage   77.03%   77.13%   +0.10%     
==========================================
  Files          22       23       +1     
  Lines        1280     1286       +6     
==========================================
+ Hits          986      992       +6     
  Misses        294      294              

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