bpipe

- another bpipe usage example
- bpipe restore cmd
completed the demo for sd-sd replication

now we also show the resources named "none"
Fixed pool directive
fixes #272: typo
fixes #273: typo
Document the configuration of autoxflate sd module.
defines xdirective latex command

\xdirective is more flexible than \directive and should be used, to describe configuration directives.
Volume Use Duration: remove misleading sentences