Issue 245: Rename window_upr to window

[athowes]

Description

This PR closes #245. This change is inline with primarycensordist.

Checklist

• My PR is based on a package issue and I have explicitly linked it.
• I have included the target issue or issues in the PR title in the for Issue(s) issue-numbers: PR title
• I have read the contribution guidelines.
• I have tested my changes locally.
• I have added or updated unit tests where necessary.
• I have updated the documentation if required.
• My code follows the established coding standards.
• I have added a news item linked to this PR.
• I have reviewed CI checks for this PR and addressed them as far as I am able.

[seabbs]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.55%. Comparing base (fa1be26) to head (96e477d).
Report is 111 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #315       +/-   ##
===========================================
+ Coverage   28.49%   88.55%   +60.06%     
===========================================
  Files          10       11        +1     
  Lines         565      402      -163     
===========================================
+ Hits          161      356      +195     
+ Misses        404       46      -358     

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