iobuf_init() needs to be called regardless of whether
iproto is initialized or not.

Do it.
Make provisions to make it possible to update readahead on the fly.

In preparation of removal of confetti and switching solely to
Lua-based configuration file, reduce dependencies on struct tarantool_cfg
and reorder server initialization, so that it can happen after the event
loop has already been started.

 * Change format of xlog/snap files to MsgPack-based format
 * Update replication to use IPROTO protocol
 * Rework replica bootstrap to process snapshot by rows
 * Add support for composite rows in fio_batch
 * Fix iproto->sync in SUBSCRIBE command

Add new system spaces _user and _priv to store users,
their passwords and their privileges.
Implement an authentication request in iproto protocol

Add a system space _func to store presistent information
about Lua functions. A function is now a subject
to ownership and privilege control.

Use MySQL-style sha1-double-hashing authentication by default.

Implement new Lua functions:

box.session.su()
box.session.uid()
box.schema.user.create()
box.schema.user.drop()
box.schema.user.grant()
box.schema.user.revoke()
box.schema.func.create()
box.schema.func.drop()

Store space creator in space definition.

What this patch doesn't implement:

- privilege checks in replication
- authentication of replication slaves
- exhaustive test coverage

Marshall replication using the primary port.

Split iproto requests into two categories: DML and admin.  Change
PING request code to 64, to lay within admin request range.
Perform administrative requests synchronously, without pushing
them into an event queue.
Add a new administrative request, IPROTO_SUBSCRIBE.

Use dynamic memory for struct iproto_request. Introduce memory
management.

Remove replication_port from the configuration file and
update tests.

Fix the test runner so that it correctly generates
replication_source to point to the primary port.
Add variable arguments to IllegalParams.
Move replia-related recovery methods to a new header, replica.h.

Remove a debug printout from box.net.lua

Update tests.

This patch explicitly saves Exception to a thread-local variable inside
struct cord on tnt_raise(). This variable can be used to safetly
re-throw last exception from any place (not only from catch() block).
This technique requires exception to be thrown and catched by pointers.
tnt_raise macros was rewritten and all 'catch (Exception &)' blocks were
substituted with 'catch (Exception *e)'.

This patch also adds a new feature to box.raise() function.
When called without arguments box.raise() re-throws last exception (if
any).

These changes needed to implement proper handlings of exception for FFI
calls.

Introduce a structure to represent a thread with an event
loop in it.

Do not require a working event loop in say() or wal_opt_sync().

Allow start of tarnatool_box in #! form.

Remove script_dir.

Make all configuration options optional (primary_port
was the last one required).
Make the configuration file itself optional.

If no watcher is started for the event loop, either based on
the config file settings, or in the #! script, do not start the event loop.

Update the test runner to take the new changes into account.

Fix a bug in symbols_load() when no symbols
could be loaded when path to executable was neither
relative nor absolute (but based on PATH).

Fix a bug with ignored return value of slab_arena_create()
in tuple.cc

Switch the parser to use msgpack for request body.
Update the python driver and tests.

net.box.test is disabled.

Use the constants consistently across the code base.

Update the protoco spec in doc/box-protocol.txt.
Update box.net.box with a bunch of hacks.
Update the python driver.

Remove support for flags variable (BOX_RETURN_TUPLE).
It was not tested anywhere! (-> kill)

Implemeng Lua msgpack.next() to support streamed processing.
Add tests.

Fix a bug with messed up aliases of msgpack.dumps() pointing
to encode() and loads() pointing to decode() (should be vice versa).

Introduce constants for ids. Update tests.

Create a data structure representing a (potentially authenticated)
session.
This structure can hold authentication token.

Remove get_socket_addr(), use existing sockaddr_in
to save in the cookie.

 * Parse request type inside of request_create
 * Remove palloc from request_create
 * Replace request_execute with a fun pointer in struct request
 * Refactor box_process API to accept struct request *
 * Create requests directly in iproto.cc and box_lua.cc
 * Update memcached, recovery and other parts to use new API

The allocator consists of a common slab cache, region and slab
allocators.
The patch provides unit tests.

It also modifies rlist_shift to be more in line with the
rest of rlist functions.

Extract the remaining places which access tuple->data
directly into tuple_to_port.cc file, which will have full
access to all tuple formats and all destinations to which
a tuple may need to be converted.

In this file it'll be possible to perform a conversion
efficiently, at the same time, it will be the only place
of cross-dependency between all tuple formats and all
conversion destinations.

Minor tweaks of the code as per a more thorough review of the 10k
patch which introduces C++ instead of Objective C.
No bugs found or fixed, only style changes.