Fix summaries in MultiGtfsInstance

[cbrowning04]

Description

This PR fixes an issue where summarise_routes(to_days=False) and summarise_trips(to_days=False) returned identical results. This has been fixed by dropping duplicates.

Fixes #228

Motivation and Context

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Test configuration details:

• OS: Windows 10
• Python version: 3.9.13
• Java version: n/a
• Python management system: Conda

Advice for reviewer

Checklist:

• My code follows the intended structure of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Additional comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (42e6dd1) 97.62% compared to head (0bb4b70) 97.62%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #233   +/-   ##
=======================================
  Coverage   97.62%   97.62%           
=======================================
  Files          20       20           
  Lines        1770     1770           
=======================================
  Hits         1728     1728           
  Misses         42       42           

Flag	Coverage Δ
unittests	97.62% <100.00%> (ø)

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[r-leyshon]

Have checked numbers of routes against the Newport and Chester feed routes and confirmed that the numbers are as expected. Here with mult gtfs:

Here with single GTFS:

Trip count is different: