Add a test case.
The bug itself is fixed in the master.

Remove Engine::finish().
Encapsulate tuple reference management into Engine.

Sophia::rollbackStatement is not implemented.

long-run tests don't pass for sophia.

* Fix gh-698: duplicate-key error followed by segfault

* Add long_run test suite, which include test case from the
ticket for memtx and sophia engines.
Result files must be zero-diff

Test script also has been fixed in a number of ways:
  a) crud operation on sophia space always return nil
  b) sophia_space:len() is not monotonous
  c) update of primary key is not allowed

* Fix return of vclock_sum() as wal_writer() result, reuse
it for txn->signature

* Fixed incorrect tuple guard usage in execute_delete()

* Fixed sophia delete operation: return old_tuple as an
exception for SophiaIndex::replace(). Do not skip
wal_write() and correctly set txn->signature

* Put engine commit code after wal_write(), reuse proper
txn->signature. Engine->commit yet can throw an exception
on concurrent transaction conflict or error

* rollback sophia transaction on conflict

* add second test for gh-698; rename and disable zlong_run tests

* make rollback statement engine specific

* make txn_finish() engine specific; use it both by commit/rollback to gc

* refactor execute_delete()

* upgrade sophia submodule: efficient msgpack storage

* engine api: style fixes

Conflicts:
	src/box/index.h

Code review fixes for sysview branch.

Accept patches from Jörg Richter which fix a bug and implement
a todo item in the small allocator, and change slab_alloc_minimal to
16, to work well out of the box with small tuples.

Add missing comma to iproto_constants.c.

Required for #194

A fix and a test case for gh-791: call() return value can't contain
a Lua map.

Treat a map as a scalar, i.e. convert it to a tuple field on return
from call.

Use a simple heuristics to distinguish a map from an array:
if the first key of the map is integer 1, it's an array.
This approach works pretty well for JSON maps, which can't have
non-string keys anyway.

If failed to set locale to C.UTF-8 (the standard one which supports UTF-8),
try other options. Keep trying ad naeuseam to silence the warning,
since this raises support questions.

CentOS 6.6 has en_US.utf8.
Debian, FreeBSD and Darwin have en_US.utf-8.

Provide a good memory footprint out of the box.