Timeslice equalisation

[tsmbland]

Description

Please include a summary of the change and which issue is fixed (if any). Please also
include relevant motivation and context. List any dependencies that are required for
this change.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change to fix an issue)
• New feature (non-breaking change to add functionality)
• Refactoring (non-breaking, non-functional change to improve maintainability)
• Optimization (non-breaking change to speed up the code)
• Breaking change (whatever its nature)
• Documentation (improve or add documentation)

Key checklist

• All tests pass: $ cargo test
• The documentation builds and looks OK: $ cargo doc
• Update release notes for the latest release if this PR adds a new feature or fixes a bug
  present in the previous release

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

❌ Patch coverage is 98.36066% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.90%. Comparing base (0bd50cf) to head (aa668f1).

Files with missing lines	Patch %	Lines
src/simulation/optimisation/constraints.rs	98.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##           asset_equalisation    #1478      +/-   ##
======================================================
+ Coverage               89.80%   89.90%   +0.09%     
======================================================
  Files                      60       60              
  Lines                    8478     8539      +61     
  Branches                 8478     8539      +61     
======================================================
+ Hits                     7614     7677      +63     
+ Misses                    547      544       -3     
- Partials                  317      318       +1     

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