Implement blueprint
https://blueprints.launchpad.net/tarantool/+spec/wal-mode-none

Add wal_mode = none setting.
It's possible to chagne wal_mode without restart.

When wal_mode = none, we don't write to WAL.
It's still possible to take a snapshot.

Replication and hot standby are currently not
operational in this mode.

End the copyright madness. Tarantool authors maintain a shared
copyright on the code base. Remove individual copyright (c) from
specific files and put a single AUTHORS file in the project top.

A fix and a test case for Bug#1030856
'box.update() doesn't support subtract, contrary to the user guide'

Add subtract support, add a test.

Conflicts:
	mod/box/index.m

A fix and a test case for Bug#911641
"box.fiber.sleep() works incorrectly if a fiber is attached".

Use symmetric scheduling for attached fibers. This allows box.insert(),
box.update(), box.delete() box.fiber.sleep() in an attached
fiber just the same way as in a detached one.

Add tests.

Now it's possible to resume() a fiber created in another fiber.

Conflicts:
	mod/box/tree.m

https://bugs.launchpad.net/tarantool/+bug/1025547

Add a Lua binding for the implicitly configured memcached space.
Add a test.

Fix a regression with nested @finally not being
called, introduced in 1.4.7 release.

Big thanks to David Chisnall for a swift fix in GNUStep Objective C
runtime.

Add unit tests for two Objective C runtime properties:
nested finally handling and ability to catch C++ exceptions.

Manually resolve conflicts (new ObjC runtime).

Conflicts:
	mod/box/index.h

under Mac OS (unreasonable stalls), changing to the subprocess.communicate with the same
functonality

Lua tests don't pass though.

gcc interpretation of -fno-inline has changed between 4.6.1 and 4.6.3.