Add settings for tests that involve downloading templates from an S3 object store.
Add helper types for creating CopyCmdAnswer objects in response to CopyCommand requests,
Use AWS .NET SDK from Nuget for S3 access.  License is Apache V2.0
Add test for two permutations of CopyCommand: s3 template to primary store, primary store template to primary store volume.
Centralise all tests into one file, which simplifies the code base.
Add copy command for two permutations:  s3 template to primary store template and primary store template to primary store volume.
Remove unused file from test project.
Include AWS .NET SDK from Nuget in project dependencies.
Separate test and non-test config settings.  Test settings are in the User section.  The non-test settings are in the Application section.
Remove unused sections.  They will only confuse other developers.
test app.config missing keys for S3 account.