Reviewed-by: Konstantin Osipov <kostja@tarantool.org>

drop some ev_watchers from fiber structure.

Move mod/box/ src/box. Fix broken packages.
Rename tarantool_cpack.cmake to cpack.cmake.

- Add support for [sS] format in box.pack (16-bit integers)
- Add support for [b] ans [s] format in box.unpack (8 and 16-bit integers)
- Fix docs

https://blueprints.launchpad.net/tarantool/+spec/support-bitwise-ops-in-lua

Make bitop available in the interpreter.
Extend the docs. Document tonumber64.

user can't make new snapshot until previous snapshot is saving

daemon can watch box.info.snapshotting variable do stop its loop temporary

Move print_stat to admin.rl
Make tarantool_lua_stat.m a bit simpler.
Restore the original formatting of show stat.
Fix a bug when rps and total were reversed
in the new show stat output.

Make names a bit more consistent, add comments,
fix style.

Fix style, add comments, expand the manual.