make output of spectra unique within a group

src/fr/inra/pappso/xtandempipeline/output/SpreadSheets/OdsSpectraOutput.java

@@ -183,8 +183,10 @@ public class OdsSpectraOutput {
 				logger.debug("pepMassSet numbering");
 				pepMassSet.numbering();
 
+				// sample scans may be shared within a group
+				HashSet<HashSampleScan> uniqueHashSampleScan = new HashSet<HashSampleScan>();
+
 				for (SubGroup sg : group.getSubGroupSet().getSubGroupList()) {
-					HashSet<HashSampleScan> uniqueHashSampleScan = new HashSet<HashSampleScan>();
 
 					for (HashSampleScanSetProt hashProt : sg
 							.getHashSampleScanSetProtList()) {