Remove Debian Squeeze support.

Add forgotten tarantool error.

Save tuple field offsets for indexed fields in the tuple.
Merge tuple validation and initialization of field maps in the tuple.
Make formats work for an incorrect tuple.
Make tuple_field() inline.

Use formats when creating tuples.
Store format id in the tuple.

1) Moving ./test-run.py --gdb from xterm (or another standart X terminal emulator) to detached Screen session
2) Moving from unnecessary dependency "pexpect" to builtin "subprocess" module.

Refactor space cache code, create indexes
in space_create().

Remove init_storage option.

Move struct key_def into an own header.
Rename key_def methods to follow the coding style.
Rename field_data_type to field_type.
Instead of panicking on key_def initialization
error, throw an exception.

Conflicts:
	test/replication/memcached.test
	third_party/luajit