changing exit --> return to avoid killing the terminal on an error exit msg

diff --git a/core/countReads.sh b/core/countReads.sh
index 159a222..cd9ca61 100755
--- a/core/countReads.sh
+++ b/core/countReads.sh
@@ -87,7 +87,7 @@ if [[ -f $scriptsDIR/auxs/auxFns.sh ]]; then
         . $scriptsDIR/auxs/auxFns.sh --source-only;
 else
         echo "Error auxiliary file: " $scriptsDIR/auxs/auxFns.sh "NOT found!"
-        exit
+        return
 fi
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