Added default to argument calculate.simex=TRUE in analyze SGP to bypass explictly specifying simex parameters and changed names(SGPstateData)
Tidying up spacing
Bug fixes in simex.sgp of studentGrowthPercentiles
Changed data to tmp.data to avoid issues with the function called data
Merge pull request #496 from dbetebenner/master

Update of simex code to maximize efficient of SIMEX measurement error adjusted estimates