Move save output to end of update and add a outputSGP of just the added data
Fix issue when SGP_Configuration is NULL and then adding a new/temporary element
Switch outputSGP position to ensure 'Data/Updated_Data' directory is created.
Add @SGP slot to tmp_sgp_object before combineSGP
specify analyses conducted in combineSGP element of update
Change determination of update.years
Add grades argument and usage in abcSGP and analyzeSGP.  Add in missing passing of content_areas too.
Add duplicate removal for SGProjections
Only output 'just additional update data' when update.years are in added data.  Fails when only priors are added.  Move save full stu history to get those results more quickly.
Fix duplicate check - need merged FULL data, not update subset.
remove reference to @SGP in simple list
Merge branch 'master' of github.com:CenterForAssessment/SGP
Create Data/Updated_Data directory if it doesn't already exist
Merge pull request #540 from adamvi/master

Changes and additions needed to run updateSGP for additional priors (based on TCRP)