The new server snapshot format is identical to format of
XLOG, i.e. it contains REPLACE statements with BOX_INSERT
flags for every tuple in a space.

This allows to streamline recovery, since rows from a snapshot
can be treated the same as rows from the write ahead log (XLOG).

This is an incompatible change:
 - tarantool 1.5 won't be able to read data of tarantool 1.6
 - tarantool 1.6, without extra effort, won't be able
 to read data of tarantool 1.5 (a conversion procedure is needed).

 This change as such doesn't break replication, but further changes
are in the pipeline which will inevitably finish this matter up as well.

Why this patch is necessary
---------------------------

To create system spaces dict-v5 branch employs on_replace triggers
mechanism, fired off by txn_replace(). Thus it's vital that all changes
go into spaces using txn_replace().

What else this patch does
-------------------------

- since now XLOG and SNAP have the same format, log_io.cc
code has become a bit simpler
- struct key_def is re-factored to simplify dynamic creation/deletion
of keys
- reference counting for tuple formats is added
- a number of error messages is improved to provide part no
in a multipart key.
- space cache is split away from space.cc into a separate
module, schema.[h,cc]

fix link url and some typos

* 	Implementing LUA printer (https://blueprints.launchpad.net/tarantool/+spec/tc-lua-printer)
* 	Moving xlog printer code into tc_print_xlog.{c,h}, leaving basic printing code in tc_print.{c,h}.
* 	Fix TC bug (https://bugs.launchpad.net/tarantool/+bug/1185746), Added support for snap print formatters.
* 	Added temporary workaround for option (-B or --bin), that allow you to print STR instead of INT and INT64 in lua formatter.
	Works in "keys" and UPDATE (ASSIGN or INSERT).
*	Fix of stdin: add custom function for pipe instead of stdin (very slow with readline)
*	Fix for realloc problems
	1) 	if size is 0, then behaviour is undefined
	2) 	in C99 if realloc returns NULL, and size is not zero (errno == ENOMEM) input buffer of memory is needed to be freed manually.
		Whitepaper of POSIX standart:
		http://pubs.opengroup.org/onlinepubs/9699919799/functions/realloc.html
*	Add support of -D (--delim) argument, that sets delimiter on start of tarantool client.
	Also, if you "cat" .snap or .xlog files in LUA format it prints delim in end of every coomand.

https://github.com/mailru/tarantool/issues/20

https://github.com/mailru/tarantool/issues/20

The patch which removes the CPack-generated spec
and adds a proper spec for client, server and library
was done by Dmitry Simonenko.

Hand-port the patch to the master, since it's gone too
far away from the origin and merging it ends up in a mess.

buffer (#16)
https://github.com/mailru/tarantool/issues/16

This messes the old "core/module" paradigm quite a bit, but Box,
while a neat name, was confusing people.

tarantool_box is preserved as the daemon name.

-H add headers to the raw format output (xlog and snapshot)
-I read xlog content from the stdin

https://bugs.launchpad.net/tarantool/+bug/1131755