Allow customizable copyright footer

[donsizemore]

Thu-Mai would like for us to be able to protect the Odum and UNC names and logos, in addition to anything that doesn't have established user terms. This may better be tacked on to issue #2905.

[pdurbin]

#2003 is related and currently has a milestone of 4.6. When @tdilauro visited a few months back he talked about how he tweaked the footer to add information that presumably currently lives in their DVN 3.x instance at https://archive.data.jhu.edu/dvn/ (he also added a Johns Hopkins banner to the top, he said).

[pdurbin]

I made a minimal pull request at #3380 to show the part of the code that needs to change. Docs and tests need to be added.

[pdurbin]

@mheppler and I discussed 242080d this morning and there a few things we'd like to address:

• Roll in a fix for Footer: Make Copyright Date Dynamic #2905 to make the copyright date dynamic
• Have "Copyright © 2016, " be system generated but have "The President & Fellows of Harvard College" be configurable.
• For performance use settingsWrapper.get rather than systemConfig.footerCopyright
• Document the new setting.

[djbrooke]

@pdurbin @mheppler

May we just do the final bullet and call this done instead of expanding this?

[pdurbin]

I just rolled the dynamic copyright year issue (#2905) into my pull request for this issue (#3380) since they are so closely related. @djbrooke indicated that if the fixes are trivial they could be given a milestone of 4.5.1, which I just did. I also documented the setting in the installation guide.

I didn't address the performance concern. I'm not actually sure if settingsWrapper.get performance stuff is compatible with how I'm doing things. @scolapasta would know.

At https://waffle.io/IQSS/dataverse I'm moving this to QA since I'm happy with the solutions.