Minor logic bug fix and additional of NULL to avoid R CMD check warning
Update of RLI meta-data and updateSGP output funcionality
Passing through additional arguments for better RLI integration
Putting ACHIEVEMENT_LEVEL creation inside of create.additional.variables clause in prepareSGP
Merge pull request #591 from dbetebenner/master

Minor refinements and bug fixes for RLI implementation
Merge conflict fix
Merge SGPstateData conflict