Call os.path.expanduser in modules so things work as expected even when using ./hacking/test-module script

Check md5sum before overwriting a file. Unconditionally copying changes the timestamp.

still needs to daemonize.  Then, once done, playbook can be taught how to poll async within the
timing window.

all modules take a common parameter name.  But more or less we still work idempotently
in modules.

module works differently now

starter manpage for modules

allow template file location to be passed into template & setup modules

also fix a bug/typo in the reporting from playbook

onchange events like Puppet's file providers do.