tests: added DNET_IO_FLAGS_COMMIT test
recovery: recover ts and user_flags
ext: optimized blob_read()

Previous implementaion had rather big overhead but had an advantage of
being simple - it has single code path for compressed and non-compressed
data.
Now it's time to split this single codepath for more efficient
implementaion of common case - read of non-compressed data.
ext: lookup now supports extended format
recovery: do not show zero counters
recovery: do not use removed ctx.node
dnet: simplify dnet_send_file_info_without_fd()

Also by providing '\0' as filename this fixes null pointer exception
that can be reproduced via ioclient -L.
python: setup.py spacing fixes
python: prettify package_dir
recovery: yet another reordering

Package now called elliptics_recovery which is consistient with main
package name.
Also get rid of useless `recover' prefix.
recovery: dc: cosmetic fixes
Merge pull request #103 from SaveTheRbtz/master

Performance, recovery and extended header fixes.