manual skeleton
fix make check on OS X
Added client-test tool.

Client side SX testing:
- volume creating and removing
- files copying and removing
- deduplication
- replica
- revisions
- filters
support --config-dir and --filter-dir in client-test
fix error msg
use client-test during make check
unfuck server-report
Introduce data extraction from node

Add --extract option to sxadm

Add sx_hashfs_extract() which takes all volumes, for which given node is
a volnode, iterate over all files stored in meta databases and try to
copy blocks to files stored in directories called with volume name.