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.

Review fixes:

- New configuration variable 'replication_protocol'
is defined in the configuration file. The original patch
would hand-craft it into generated files.
- Simplified  numeric version id generation.
- Removed timeouts from new sio_* calls. They did't quite work,
especially with blocking sockits. Timeouts should at least use
select(), which updates wait time on exit..
- Removed include cfg/tarantool_box_cfg.h into recovery.cc, instead
passed around all arguments explicitly.
- Removed unused headers.
- reused handshake code in master and replica
- simplified handshake in replica fiber
- removed clutter
- touched here and there.

Tuples are got a big bigger with shared-arena patch (4 bytes
per tuple overhead).

So we exhaust the current arena in out-of-memory test a bit
faster than before.

Fix https://github.com/tarantool/tarantool/issues/44

A copy-paste implementation of print(64 bit number)
used to add an extra newline at the end of printed string.

When looking for the next xlog to recover from, take
into account gaps in LSNs which may occur due to wal_write()
failures.

Add test coverage for create/drop space and error injections.
Add cleanup to alter_limits.test

Fix a crash when box.fiber.find() is called with no arguments.
Add a check for empty Lua stack.
Add a test.

2. modify errmsg
3. rewrite Lua - check_type
4. Move try-except importerror to test_suite file

Move test files to new format of box_connection output (yaml-like). Move stat test to LUA. We may move reconfigure.test(??) and sql test to LUA, i suppose

Add first support of python backend for TT. Still need to add support of error code (now it return 0 everytime)

Implement tuple validation when building a new index.
This introduces such checks as for field type, presence of a field,
etc. in all tuples added to the new index.

Add error code ER_INDEX_ARITY, update tests.

Add a check that the primary key is always unique.

Test unique -> non-unique transition.

Debug index:alter().
Add tests for changes in index id, name, type, unique/not unique.
Make box.space[i].index[j] output yaml-parsable (- idx: index 0
parsing problem).

Cover basics of CREATE INDEX.
Add support for index names.
Maintain index names in Lua.

Fix memory leaks this test has revealed.