Added missing options to the configure help string

configure.ac

@@ -1911,7 +1911,7 @@ esac
 # Feedback model
 AC_ARG_WITH([feedback],
    [AS_HELP_STRING([--with-feedback=<model>],
-      [Feedback model to use @<:@none, EAGLE, debug default: none@:>@]
+      [Feedback model to use @<:@none, EAGLE, GEAR default: none@:>@]
    )],
    [with_feedback="$withval"],
    [with_feedback="none"]
@@ -1944,7 +1944,7 @@ esac
 # Black hole model.
 AC_ARG_WITH([black-holes],
    [AS_HELP_STRING([--with-black-holes=<model>],
-      [Black holes model to use @<:@none, default: none@:>@]
+      [Black holes model to use @<:@none, EAGLE default: none@:>@]
    )],
    [with_black_holes="$withval"],
    [with_black_holes="none"]
@@ -1973,7 +1973,7 @@ esac
 # Task order
 AC_ARG_WITH([task-order],
 [AS_HELP_STRING([--with-task-order=<model>],
-[Task order to use @<:@none, EAGLE, GEAR default: none@:>@]
+[Task order to use @<:@none, EAGLE, GEAR default: default@:>@]
 )],
 [with_task_order="$withval"],
 [with_task_order="none"]
@@ -1991,8 +1991,8 @@ case "$with_task_order" in
 EAGLE)
 AC_DEFINE([TASK_ORDER_EAGLE], [1], [EAGLE task order])
 ;;
-none)
-AC_DEFINE([TASK_ORDER_NONE], [1], [Default task order])
+default)
+AC_DEFINE([TASK_ORDER_NONE], [1], [Default (i.e. EAGLE/OWLS) task order])
 ;;
 GEAR)
 AC_DEFINE([TASK_ORDER_GEAR], [1], [GEAR task order])