Other changes:

 * Fix #708: catch exceptions in boxffi_iterator_next
 * Optimize index:get() to directly use index:findByKey() instead of
   box_process() + execute_select() + iterator->init() + iterator->next()

Turn off jit for box.commit(), which yields.
A test case is missing since I failed to crash the
interpreter from the test suite (apparently it needs
a more complicated background logic than one can do in
a test case).

Fix a typo in bsdsocket.lua (a merge error).

Use engine flags rather than a virtual method to
check engine capabilities.
Use index name in the error message.

Conflicts:
	src/box/errcode.h
	test/box/alter.result

Do not involve in tarantool transaction log regarding
old_tuple (replace always return NULL).

This reduces transaction statement complexity from
tarantool side to a single sophia operation
(do replace instead of search + replace).

weak spots: txn_rollback_stmt()

2) added disabled error-injection test that crashes tarantool rtree index

Use a monotonically growing sequence for space identifiers,
to ensure they are never reused.

Update tests.

If socket is not a proper acceptable socket (-1, for example), break the
server accept loop, to avoid CPU hog.

Conflicts:
	src/lua/bsdsocket.lua
	src/sio.cc

Do not terminate the server on accept error.

This patch also fixes EINTR and EWOULDBLOCK handling for
socket:read() and socket:write() wrappers.

Pass instance name to tarantoolctl, for .log.1 logs the
file extension was not truncated.

First, send a snapshot to the slave, and only then register
the slave with the cluster.
Misc cleanups.

Conflicts:
	src/lua/init.cc
	test/box/lua_sandbox.result
	test/box/lua_sandbox.test