[#42136521] Correctly handle changes to the volume files

Remove any DbFile references before updating the PlateVolume instance,
as this ensures that there will only ever be one associated.
[#42042735] Update TagLibraryLayout seeds to include Pulldown defaults
Merge pull request #716 from seandunn/42042735_update_seeds_for_pulldown

[#42042735] Update TagLibraryTemplate seeds to include Pulldown defaults
Merge pull request #715 from mattdenner/42136521_plate_volume_information_is_not_being_updated

[#42136521] Correctly handle changes to the volume files
[#42198561] Upgrade to Rails 2.3.15
Merge pull request #717 from mattdenner/42198561_rails_vulnerabilities

[#42198561] Upgrade to Rails 2.3.15
[#41298561] Fix nested joins

Seems that the vulnerability fix:

https://groups.google.com/forum/?fromgroups=#!topic/rubyonrails-security/l4L0TEVAz1k

Has meant that some of our queries across multiple tables has been
broken.  These two files are the first identified and easily fixed.
Others will probably follow from production usage.
Merge pull request #719 from mattdenner/42198561_rails_vulnerabilities

[#41298561] Fix nested joins