*8356* Add user agent to PayPal IPN requests
*8979* Drop specific SSLv3 configuration
Submodule update
Submodule update
*8986* Fix non-standard SQL quoting
Merge pull request #327 from ppv1979/ojs-dev-2_4

Add string to ru_RU locale
*8777* Dataverse plugin: reactor redundant code

Reactor redundant code in create/update study, single/multiple file deposit methods.
Merge pull request #343 from jwhitney/8777

*8777* Dataverse plugin: reactor redundant code
*8991* Update Dataverse dataset with citation when article published

Metadata for a dataset created on editor acceptance includes an in-press article citation. Update dataset metadata on publication to include citation for published article.
*8992* Replace Dataverse files when updated in OJS

If a suppfile has been deposited in Dataverse, then later a modified or different file is uploaded through OJS, the earlier data file is removed and the new file is deposited.

This prevents orphaned (i.e., not accessible from OJS) files on the Dataverse side and avoids filename collisions described in https://redmine.hmdc.harvard.edu/issues/3301.
Merge pull request #344 from jwhitney/8991

*8991* Update Dataverse dataset with citation when article published
Merge pull request #345 from jwhitney/8992

*8992* Replace Dataverse files when updated in OJS