Conflicts:
	src/lua/init.cc
	test/box/lua.result
	test/box/lua.test

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

Conflicts:
	test/box/alter_limits.test.lua

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

Conflicts:
	src/lua/init.cc
	test/box/fiber.result
	test/box/fiber.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

Conflicts:
	client/tarantool/tc_cli.c

Conflicts:
	client/tarantool/tc.c

Conflicts:
	client/tarantool/tc.c

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.