Absolute imports

[CasperWA]

Use absolute imports everywhere, except for __init__.py files as well as in test_*.py files.

Fixes #298

[codecov]

Codecov Report

Merging #483 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #483   +/-   ##
=======================================
  Coverage   91.64%   91.64%           
=======================================
  Files          60       60           
  Lines        2848     2848           
=======================================
  Hits         2610     2610           
  Misses        238      238           

Flag	Coverage Δ
#unittests	91.64% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
optimade/models/baseinfo.py	95.23% <100.00%> (ø)
optimade/models/entries.py	97.43% <100.00%> (ø)
optimade/models/index_metadb.py	100.00% <100.00%> (ø)
optimade/models/links.py	100.00% <100.00%> (ø)
optimade/models/optimade_json.py	95.74% <100.00%> (ø)
optimade/models/references.py	97.67% <100.00%> (ø)
optimade/models/responses.py	97.56% <100.00%> (ø)
optimade/models/structures.py	95.08% <100.00%> (ø)
optimade/server/mappers/links.py	100.00% <100.00%> (ø)
optimade/server/mappers/references.py	100.00% <100.00%> (ø)
... and 8 more

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[ml-evs]

I think I only cared about absolute imports in the app code before, but fair enough 👍

I guess this makes sense if you're pulling out some of the guts and modifying them too.

Cheers @CasperWA!

[CasperWA]

I think I only cared about absolute imports in the app code before, but fair enough +1

I guess this makes sense if you're pulling out some of the guts and modifying them too.

Yeah, I think it's just good practice all in all.