sio_move_iov is not built to advance both obuf_svp and iov,
tweak the code to make sure it does what's needed.

gh-983 still needs a test case.

In case of partial write the savepoint was advanced beyond end position.

With structured configuration, i.e. a Lua table for a list of
replication peers, it is difficult to pass a configuration option
to the hook function as a single C object. Don't pass
options in, but query them from the hook function with cfg_get*
API.

As a result, all "change" hooks have the same signature now,
a step closer to the pluggable configuration API.

Introduce a layer of wrappers for a number of internal box functions,
dealing with accss to spaces and indexes.

These wrappers:
    * don't throw exceptions
    * have a common prefix box_
    * are exported in the server development headers

Rewrite Lua C bindings to use the public API described above.
Rewrite Lua FFI bindings to do the same.
Add test.

- update comments
- fix the logic of partial write recovery (still needs a test)

Conflicts:
	src/box/alter.cc
	test/app/snapshot.test.lua

* style fixes
* fix a bug in key opts decoder (alter.cc)
* ensure dimension is visible in box.space
* rebuild bootstrap.snap to use the new format

cmake 2.8.9 doesn't have CMAKE_CXX_COMPILER_VERSION

- fix net.box to satisfy strict.lua requirements
- after review fixes
- fix buffer:checksize() in buffer.lua