Plot Order Features

[dwaring87]

Description

This adds a few feature requests related to sorting plots:

• Adds the option to include subplots or plants (if created) in the plot order download (from trial layout):

• Adds an optional plot_order column to the generated field book trial file that can be used to sort plots in fieldbook:

Checklist

• Refactoring only
• Documentation only
• Fixture update only
• Bug fix
  • The relevant issue has been closed.
  • Further work is required.
• New feature
  • Relevant tests have been created and run.
  • Data was added to the fixture
    • Data was added via a patch in /t/data/fixture/patches/.
  • User-Facing Change
    • The user manual in /docs has been updated.
  • Any new Perl has been documented using perldoc.
  • Any new JavaScript has been documented using JSDoc.
  • Any new legacy JavaScript has been moved from /js to /js/source/legacy.