Sort occurrence table by occid by default

[zygoballus]

This is to fix the issue described at BioKIC/symbiota-docs#635.

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.
• Hotfixes should be branched off of the master branch and squash and merged back into the master branch.
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• There are no linter errors
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• Symbiota coding standards have been followed
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• Comment which GitHub issue(s), if any does this PR address
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Post-Approval

• It is the code author's responsibility to merge their own pull request after it has been approved
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• Don't forget to delete your feature branch upon merge. Ignore this step as required.

Thanks for contributing and keeping it clean!

[zygoballus]

Note that I haven't tested this at all. Please check that it actually works and doesn't mess up the other sorting options before merging!

[zygoballus]

Looking at this more closely, I don't think I implemented it right. Probably needs to be something like:

else{
    $sql .= 'ORDER BY (o.occid) '.$this->qryArr['orderbydir'].' ';
}

added after line 579.