change long snake (__) to dash (-). needed for post-xfer exec and pre-xf...

Hi,

I was missing the possibility to add post-xfer and pre-xfer exec to the rsyncd.conf. As a workaround I've added a feature to change "__" to "-" in resource attributes.

I'm not really happy with this syntax, but it was an easy fix.. :) If there are better options, please let me know.

Cheers
Dennis