Population.sql : modified the query to include the new sorting index column

Delete.report.xml, OpenCytoPreprocessing.report.xml, SampleGroups.report.xml : added metafiles to all of the R scripts in order to have them hidden in the Study's Data View web part

OpenCytoPreprocessing.R :
- modified to include the customized save_gslist_labkey() method, removed inefficient extra load_gslist()
- refactored writeProjections() subroutine to write to the data base integer indices of the populations

opencyto_preprocessing-0.00-0.01.sql, opencyto_preprocessing.xml : changed the schema to contain the integer index of each population (in place of the short name)

Spinner folder : added custom Spinner widget