Add jat__die() suicide pill

src/jat.sh.skel

@@ -266,6 +266,19 @@ jat__cmp() {
     esac
 }
 
+jat__die() {
+    #
+    # Log error $1 and exit this script abruptly
+    #
+    local msg
+    local msgs=()
+    for msg in "$@"; do
+        msgs+=("fatal: $msg")
+    done
+    jat__log_error "${msgs[@]}"
+    die "${msgs[@]}"
+}
+
 jat__eval() {
     #
     # Assert that code $1 exits with zero (or other)