Have saturnin-conf exit with useful statuses

src/shellfu/saturnin.sh

     debug -v files
     #shellcheck disable=SC2086
     _saturnin__conf__load "${files[@]}" | inigrep $ig_limit $ig_mode $ig_query
+    return "${PIPESTATUS[0]}"
 }
 
 saturnin__get() {
     # Take paths and applying merge strategy, load file(s)
     #
     local path
+    local found=false
     while read -r path;
     do
         test -f "$path" || continue
+        found=true
         case $Strategy in
             first)
                 debug "winner: $path"
                 ;;
         esac
     done
+    $found
 }
 
 _saturnin__conf__load() {
     # with 'first' strategy, first existing file is printed, with
     # 'join' strategy. all existing files are printed.
     #
-    local arg trydir trypath
+    local arg trydir trypath es
+    es=0
     for arg in "$@";
     do
         case $arg in
             -|*/*)      # stdin, or path (with slash)
-                cat "$arg"
+                cat "$arg" || es=3
             ;;
         *)              # name given, find all its incarnations
             debug -v SATURNIN_CONF_PATH
                     trypath="$trydir/$arg"
                     echos "$trypath"
                 done \
-              |  _saturnin__conf__merge
+              |  _saturnin__conf__merge; es=$?
             ;;
         esac
     done
-    true
+    return $es
 }
 
 _saturnin__conf_usage() {