Change tmp.lookup to account for changes in data.table 1.8.10.  Add V1=… to cover prior data.table versions
Add parallel config to be passed in to studentGrowthPercentiles
Add comma
Update baselineSGP documentation for parallel config
Allow order of FIRST/LAST OBS in lookup/datapull vary depending on sgp.iter (otherwise column order is wrong for some configs)
Merge pull request #457 from adamvi/master

Additional updates to baselineSGP (and getPanelData) to work with YEAR_WITHIN