Update error messages.
Follow the coding style in C function naming.

Added lots of checks and nice error messages.
Added lots of tests

Disallow upsert in presence of a unique secondary key.

Update tests.
Fix typos.

 * Update iproto.cc to use greeting_encode()
 * Update replica.cc and net.box to use greeting_decode()
 * Add a parsed remote version to net.box and struct replica
 * Remove duplicate code

Protocol change:

 * During binary protocol handshake sent
    "Tarantool 1.6.7-83-gc6b2129 (Binary)" instead of
    "Tarantool 1.6.7-83-gc6b2129              @custom_proc_title"
   This change is backward-compatible up to 1.6.1.

* rename 'time' to 'clock'
* remove time.bench64, I can't think of a use case

Partially reverts squashed 316d4e3a

iproto thread can add quirks to thread scheduling, replace
single-call yields with yields in a loop.

Correct return value of ipc_channel_put(), since
it may return an error if the channel is closed.

Make get/put functions inline.

Remove a public declaration for ipc_channel_is_readonly() (towards
removing the concept of readonly altogether).

This test was disabled by me during 1.6 async-master-master development.
Since Tarantool doesn't use proc_title for replication status anymore,
I added a new test that check box.info.replication.

Linux-specific option obsolete since kernel 2.2

Wait() no longer called hence waiters not initialized. Does it make
sence to have a test for :waiters (undocumented internals)?

- Waiting on a brand new socket (neither listen nor connect called)
  completes immediately with HUP status on Linux. However on FreeBSD/osx
  it never completes.

- Attempting to connect to a port bound on a loopback interface which is
  not yet listening yield ECONNREFUSED in blocking mode on Linux. On
  FreeBSD/osx blocking connect never completes ("never" means it doesn't
  complete in a reasonable time).

- Calling shutdown() on a listening socket works in Linux but in
  FreeBSD/osx it doesn't.

iproto thread can add quirks to thread scheduling, replace
single-call yields with yields in a loop.

I've added default tuple fields check against primary index key.
Primary key can yet be updated, but an old key will be
silently used anyway (copy used from update object).

Added tests.

ps. maybe it is better to validate upsert ops on execute?

Work the same way as box.stat does.

Support access by index: box.sophia['compaction.page_size']
and by call box.sophia()

gh-1017 double-run bug fixed, and fixed same bug in stat_net. But bug with probability doesn't repeated

gh-1017 double-run bug fixed, and fixed same bug in stat_net. But bug with probability doesn't repeated