- update to version 2.22
-- Sort modules by name before initialization so that modules
initialize in a reproducible order.
-- New option -M name,... forces load of misc modules by
name, thus allowing users to select between conflicting
modules.
-- Fix parsing of hostlist expressions with multiple brackets
-- Fix for coredump when no rcmd module is loaded.
-- Fix duplicate error output from ssh module.
-- Add -e option to pdcp to explicitly specify remote execution
path.

- Rewrite of the ssh module using the same framework as the existing
"exec" module.