Add PropertyCheckConfiguration which uses anyvals, and deprecate PropertyCheckConfig.
Add transitional trait HasMaxDiscarded to handle case of implicitly converted PropertyCheckConfig and a minSuccessful usage.
Add maxDiscardedFactor factory method and tests.
Adapt PropertyCheckConfigSuite into PropertyCheckConfigurationSuite.
Separate out PropertyCheckConfigurationHelperSuite.
Add SizeRange and sizeRange, deprecating MaxSize and maxSize.
Change non-deprecated PropertyCheckConfigParam classes to use anyvals.
Use PosX.from factory methods, because "you cannot use macro implementations in the same compilation run that defines them".  If scalactic were in a separate compile, this would go away.
Ensure all references to PropertyCheckConfig -> PropertyCheckConfiguration.
Implement SizeRange in Configuration#getParams
Use private scalatest field indicate whether to use legacy param values.