Populated individual Date fields

[egbot]

• Add code to the occurrence editor that automatically populates year, month, day, startDayOfYear, and endDayOfYear from eventDate fields whenever they are are modified
• Add code to the statistics generator code that populates missing or incorrect individual date fields for a given collection.
  Resolves issue: [3.1] Issues with eventDate parsing into year, month, day #1608

Pull Request Checklist:

Pre-Approval

• There is a description section in the pull request that details what the proposed changes do. It can be very brief if need be, but it ought to exist.
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Thanks for contributing and keeping it clean!

[themerekat]

Seems to be working!

[GregoryPost]

lgtm.