Convert box.lua to box.lua.c and compile it in.
Fix broken out-of-source build of luajit, by adding
a few more generated files to touch-nocreate rule.

validation added.

modes are added.

* SIGUSR2 handler sends SIGHUP to logger
  (default extra/logger could already handle SIGHUP).
* Add some options to cmd-line (to override config's options).

scheme added.

line (if given) 2. current directory 3. INSTALL_PREFIX/etc/tarantool.cfg