Extra UPDATE command tests was added.

Conflicts:
	core/CMakeLists.txt
	include/config.h.cmake
	mod/box/index.m

- release_disabled test suite ini file option support
- debug build only error-injection test, cmake build cleaner output
- tarantool server version output with build flags

A fix and a test case for Bu#929654 "
Regression with secondary HASH indexes"

Secodnary HASH indexes where skipped by build_indexes()
when starting from a snapshot.

Add a way to reserve space for as many values as necessary
and enable HASH indexes in build_indexes().

Add a test.

Now request is executing via 'exec sql' command instead of 'exec admin' and
the result is sorting in the test suite.

We didn't check whether or not Lua bindings executed correctly,
so we didn't pay attention to these problems:

luaL_Buffer was misused, and when configuration
would exceed 4K allocated on stack, this led
to lost pieces of Lua script prepared by
tarantool_lua_load_cfg().

box.on_reload_configuration() did not work correctly with
disabled spaces.

Fix the above mentioned issued and add a test.

Implement blueprint 'add-delete-fields':
https://blueprints.launchpad.net/tarantool/+spec/add-and-delete-fields-in-tuple

Make it possible to add new fields with UPDATE, and
delete existing fields.

Rewrite the UPDATE algorithm to pre-compute new tuple
length and do most of the work in place, without
allocating temporary buffer for fields.

Add Connector/C support for new UPDATE options.

Add and update tests.

Joint effort by Konstantin Shulgin (initial implementation),
Dmitry Simonenko (Connector/C) and
Konstantin Osipov (spec/code review).

absolute values.

installation pathes.