doc:

- Added explanations to examples in man pages for client based tools.
- Updated WqRq explanation in xtfsutil man page.
- Unified WqRq and WaR1 explanations in the user guide and created references to the R/W replication technical details section.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2888 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534