some renaming of functions

pkg/obichunk/chunk.go

@@ -0,0 +1,17 @@
+package obichunk
+
+import (
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
+)
+
+func ISequenceChunk(iterator obiiter.IBioSequence,
+	classifier *obiseq.BioSequenceClassifier,
+	onMemory bool) (obiiter.IBioSequence, error) {
+
+	if onMemory {
+		return ISequenceChunkOnMemory(iterator, classifier)
+	} else {
+		return ISequenceChunkOnDisk(iterator, classifier)
+	}
+}