Added fork and monitor options to dnet_run_servers

Fork option makes possible to use forking instead of running
several servers in one process.
Monitor option makes possible to disable monitor.
API polishing

Removed most of const_cast's uses. Added move semantic to async_result
Places binaries to correct packages

Added installing of dnet_run_servers to -dev package.
Recovery: Added draft of sdc recovery.

Conflicts:

	recovery/elliptics_recovery/iterator.py
Python: Added pickling elliptics.IoAttr and elliptics.Time
Merge pull request #442 from euroelessar/master

Polishing changes
Merge branch 'master' of github.com:reverbrain/elliptics
v2.25.4.6
tests: Wait for cocaine servers to start

Elliptics + srw starts several seconds
Python: Added id.py and allow specify elliptics.Id by hash string or int/long value of id.
Recovery: Added ability to set current value of statistic in case incrementation isn't possible. Added 'iterated_keys', 'filtered_keys', and 'total_keys' to iteration statistics.
indexes: Don't keep the lock during async requests
ioserv: Fixed using of cache_sync_timeout
debian: Add dependency on blackhole
tests: removed useless sleep
Merge pull request #443 from euroelessar/master

Several fixes in ioserv and run_servers
tests: fixed using of quick_exit
Merge pull request #444 from euroelessar/master

tests: fixed using of quick_exit
build: noexcept is missed in lucid
blackhole: finally removed from submodules