Renamed the dataset subpackage to datadoc

[jesper-friis]

Description

Renamed the dataset subpackage to datadoc

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.72%. Comparing base (624351a) to head (036638c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #298   +/-   ##
=======================================
  Coverage   76.72%   76.72%           
=======================================
  Files          22       22           
  Lines        2415     2415           
=======================================
  Hits         1853     1853           
  Misses        562      562           

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