Conflicts:
	test/box/lua_sandbox.result

Conflicts:
	test/box/configuration.result
	test/box/configuration.test

Conflicts:
	.gitmodules

Conflicts:
	src/tarantool.cc

Set signal handler for all signals, not just SIGTERM.
Print signal name to the log on exit.

Add constants for signal count. Rename. Coding style.

Instead of palloc allocator use a member of small allocators family,
region_alloc.

The plan is to remove salloc as well, and switch entire tarantool
to libsmall.

Fix a race condition in replication/swap.test, discovered with the
new allocator.

Conflicts:
	src/box/box_cfg.cfg_tmpl

Conflicts:
	include/lua/fiber.h
	src/box/space.cc
	src/memcached.cc
	src/tarantool.cc

Do not use atexit() handlers, except the global tarantool_free()
function, which does nothing in the snapshot process.

Conflicts:
	test/box/socket.test

Conflicts:
	test/box/test_init.lua