v5.0.0

• Refactor the Command class hierarchy:
  • Add GetCommand, new abstract base class for all commands that use get
  • Make Command and PostCommand abstract
  • Add SimpleGetCommand, new concrete class used (instead of Command) to invoke GET API actions without creating a subclass
  • Add SimplePostCommand, new concrete class used (instead of PostCommand) to invoke POST API actions without creating a subclass
• Refactor parameter handling for consistency:
  • createParameterMap() is now used by subclasses to create and populate a mutable map of URL parameters
  • getParameters() now returns an immutable copy of the current URL parameter map for external use, typically logging or testing
  • Commands no longer stash and reuse the parameter map; createParameterMap() always creates a new map.
  • setParameters() is now available only on SimpleGetCommand and SimplePostCommand. Custom GetCommand and PostCommand
    subclasses that need to specify parameters are expected to override createParameterMap().
  • setJsonObject() is now available only on SimplePostCommand. Custom PostCommand subclasses that need to post JSON are
    expected to override getJsonObject().
• Stop passing command subclasses when constructing every CommandResponse. The two response classes that need this now implement
  it without burdening all other commands.
• Introduce HasRequiredVersion interface and use it when instantiating CommandResponse subclasses that need required version
• Remove all Command copy constructors. Same rationale as the earlier removal of copy methods.
• Switch SelectRowsCommand and NAbRunsCommand to post their parameters as JSON
• Fix NAbReplicate to handle "NaN" values
• Remove CommandException from getHttpRequest() throws list
• Adjust the Demo.java and Test.java tests to match current sample data and Command hierarchy changes