* Make tarantool --play to understand user specified limits.
* Remove --catin, use -cat - instead.

This messes the old "core/module" paradigm quite a bit, but Box,
while a neat name, was confusing people.

tarantool_box is preserved as the daemon name.

Fix compile on older gccs.

objc/Object.h is gone in clang 3.2.

Use an own root class for all Tarantool objects.

Deprecate tarantool_box --cat.

This reverts commit 13054aaa.