Round share graph values to 14

[louispt1]

Description

This PR rounds all share graph values to 14 decimal places.
This change is to avoid floating point issues, and allow values to be easily handled with excel.

The changes go with this PR for Transformer.

@kndehaan perhaps you could functionally review these changes in the context of exporting these datasets? I tested PV27.
If you're happy with how it works, let's also get a code review from one of the developers.

Before merging:

• Decide if we want to round all values, or just share values to 14
• Update the reference commits to Atlas and Transformer in the relevant repositories
• Do we need to document this anywhere?

Related Issues

Closes this ETSource Issue

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.72%. Comparing base (8db16bb) to head (cee09e8).

Files with missing lines	Patch %	Lines
lib/atlas/graph_values.rb	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #182      +/-   ##
==========================================
- Coverage   92.75%   92.72%   -0.04%     
==========================================
  Files          92       92              
  Lines        2650     2665      +15     
==========================================
+ Hits         2458     2471      +13     
- Misses        192      194       +2     

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[louispt1]

Ok @kndehaan I have now updated Atlas and Transformer to round all graph values to 14 decimal places.

I am tagging @mabijkerk and @noracato on this PR to initiate a discussion on whether 14 decimal places is an acceptable choice for rounding as of now? It would be good to be aligned on this decision as a team (although of course we can always change our mind).