Fixes debian/#831361

* Exclude web-sites and compiled JS files
* Exclude debian/ rpm/ FreeBSD/ directories
* Exclude CI files
* Exclude CVS files
* Exclude *.pyc

* Fix hardening if backtraces are off
* Ensure that all tests are passed with hardened flags
* RPM: add --with/--without backtrace option (default is --with)
* RPM: remove dependency on libbfd, libiberty, libz if --without backtrace
* RPM: enable stripping and debuginfo if --without backtrace

Backtraces are still enabled by default.

Hardened flags used by RedHat:

  -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
  -fstack-protector-strong --param=ssp-buffer-size=4
  -pie -fPIC

* Detect multilib directories properly
* Remove duplicates from package.path/package.cpath
* Increase priority of tarantool/ prefixes
* Add Debian and Gentoo specific folders

Use values generated by cmake. Needed for homebrew.

* Don't print information if nothing has changed
* Remove -DENABLE_BUNDLED_XXX options which doesn't work
* Use common names for _DIRS and _LIBRARIES variables

Other changes:

 * Move CJSON sources to libserver to resolve dependency on lua/utils.c

Switch tarantool builds to a new RPM spec

* Add -DENABLE_DIST=ON option to enable init scripts on `make install`
* Create directories for tarantoolctl on `make install`
* Add logrotate script to `make install`
* Fix example.lua to work out of the box
* Use /etc/default instead of /etc/sysconfig on Debian
* Fix directories permissions for tarantoolctl
* Add support for systemd-tmpfiles (required by Fedora)

pod2man causes too many troubles

* Split libyaml (C library) and lua-yaml (Lua bindings)
* Add support for system libyaml-dev in CMake scripts if
   -DENABLE_BUNDLED_LIBYAML is OFF (default is ON)
* Add libyaml-dev to DEB dependencies

third_party/libyaml/ is completely identical to upstream libyaml 0.1.6.
(libyaml-0-2 in Debian/Ubuntu). Test are passed both with bundled and
system versions of the library.

third_party/lua-yaml/ is patched by me to use luaL_serializer, therefore
upstream version is not suitable for Tarantool.

This patch is needed to pass Debian package checks (lintian).

see https://cmake.org/cmake/help/v3.4/variable/CMAKE_BUILD_TYPE.html

proctitle.c: since it's now fully rewritten by us, move from third_party
process_title.c: rename to title.c

Style changes.

If building for 32 bit x86 target pass -march=i686 option to enable
atomic instructions.  i686 is usually the default arch but sometimes an
older one is selected (depends on gcc compile time configuration).

External unwind code doesn't exists for non-x86 platforms.
Allow LuaJIT to be compiled somehow.

A 'tentative definition' in C language is a global variable definition
missing both a storage class and an initializer, ex: int foo.
Traditionally it get's translated into a common symbol, allowing for
multiple definitions in different translation units to coexist.

Normally multiple definitions aren't allowed; unless they are common
symbols.  In the later case a linker picks one arbitrarily.

-fno-common alters tentative definitions translation, resulting in
a more strict and conformant semantics, multiple definitions are no
longer allowed.

This change was motivated by the OSX linker not handling common symbols
in static libraries
(https://stackoverflow.com/questions/19398742/os-x-linker-unable-to-find-symbols-from-a-c-file-which-only-contains-variables)