Removed Swagger stuff

In the end, swagger was attractive but several problems:
o Incompabilities with GAE due to use of internal sun.*
  classes and difficult to update (for us) because the
  core modules are writen in scala
o Limitations with jersey subresources
o code generator written in scala and difficult to
  get up and running
o client libraries will likely need hand-tuned
  specialization anyway, such as the java version's
  integration with geotools
[Finishes #45352275] Merge identically named Attributes together in Pivot Tables

Updates PivotSites and the UI to treat identically named attributes as the same
when we get to the pivot stage --

otherwise AttributeGroups retain their per-Activity identity, but this greatly
facilitates defining attributes across multiple activities / dbs