remet SSPS_EXT_BOTTLE au type STRING4

@tsg_nc/tsg_ncvar.csv

@@ -62,4 +62,4 @@ char;char;cell;char;char;char;char;char;double;double;char;double;double;char;do
 #;SSPS_EXT_QC;'DAYD_EXT';byte;SEA SURFACE SALINITY QUALITY FLAG;surface salinity quality;;;0;9;%1d;;;;;Quality flag applied on salinity values from external instrument;0;#
 #;SSPS_EXT_TYPE;'DAYD_EXT','STRING4';char;TYPE OF EXTERNAL DATA ORIGIN;Type of external data origin;;;;;;;;;;WS,CTD,ARGO,XBT,...;;#
 #;SSPS_EXT_ANALDATE;'DAYD_EXT','STRING14';char;DATE OF WATER SAMPLE SURFACE SALINITY ANALYSIS;;;yyyymmddhhmmss;;;;;;;;Date of sea surface salinity water sample analysis;;#
-#;SSPS_EXT_BOTTLE;'DAYD_EXT';float;SEA SURFACE SALINITY BOTTLE NUMBER;;;;;;;;;;;Number of sea surface salinity water sample;;#
+#;SSPS_EXT_BOTTLE;'DAYD_EXT','STRING4';char;SEA SURFACE SALINITY BOTTLE NUMBER;;;;;;;;;;;Number of sea surface salinity water sample;;#