Update mans, docs.

A lot of resources still need to be updated (build scripts, etc).

Don't block the event loop in the interactive mode.
Fix a merge bug (remove a debug print out from the test system).

Do not read or require tarantool.cfg. Accept all options
in the script itself. Split server reconfiguration so that
parts of the server can be reconfigured independently.
Remove dependency on confetti.

To configure the server at start, call

box.cfg{option1=value1, option2=value2}

To reset an option on the fly, do the same:

box.cfg{option=value1}

box.cfg is a Lua table with all existing options.

Make local hot standby the default and remove local hot
standby option [gh-231].
If neither primary nor admin port is specified, the server does
not get stuck in local hot standby mode, and becomes a master
immediately.

Incompatible changes:
- pid_file is nil by default, and the server does not create
a pid file by default.
- local_hot_standby option is removed
- log_level is now a dynamic option
- wal_mode is "write" by default
- box.cfg only prints non-nil options

Clean up a lot of garbage code in the test system.
Remove configuration file support from TarantoolServer
and Lua test preprocessor.

The patch also contains a few unrelated improvements in the
interactive mode (history support, ^D leads to exit).

@todo The patch disables region_gc in recovery, which
may lead to memory overconsumptions when recovering large
snapshots. This needs to be fixed separately.

@todo Remove all configuration files and confetti files
in a follow-up patch (not done in this patch to not clutter
it).

See rationale for this fix in gh-223
Remove on the same token a buch of dead code for sandboxing
and do a few renames.

Remove command line options:

--cfg-get
--check-config
--config
--init-storage

- these are gone forever, in preparation for config-less start.

--background --  move to tarantool.cfg for now, in the future
it will be part of Lua config.

Make #! mandatory - if the server is started without #!, it's
only possible to query its version or get startup help (--version
and --help are the only remaining supported options).

When #! is present, do not parse options, pass them wholly to the
script at hand.

Add helper scripts to test suites, to start/stop the server.
For now, the scripts are empty, in the future they will be
merged with a respective config file.

 * Change format of xlog/snap files to MsgPack-based format
 * Update replication to use IPROTO protocol
 * Rework replica bootstrap to process snapshot by rows
 * Add support for composite rows in fio_batch
 * Fix iproto->sync in SUBSCRIBE command

purpose: OOS-build tests fail

 * Install *.lua modules into ${DATADIR}/tarantool/1.5
    and *.so modules into ${LIBDIR}/tarantool/1.5
 * Fix default package.path and package.cpath
 * Install Lua headers to ${INCLUDE_DIR}/tarantool/1.5
 * Install config.h to ${INCLUDE_DIR}/tarantool/1.5
 * Add a new package - tarantool-dev (server development headers)
 * Use RPM Macroses in rpm.spec
 * Fix tarball generation for Debian
 * Use GNUInstallDirs.cmake to setup directories

purpose: OOS-build tests fail

deprecated connector_c tests

Add new system spaces _user and _priv to store users,
their passwords and their privileges.
Implement an authentication request in iproto protocol

Add a system space _func to store presistent information
about Lua functions. A function is now a subject
to ownership and privilege control.

Use MySQL-style sha1-double-hashing authentication by default.

Implement new Lua functions:

box.session.su()
box.session.uid()
box.schema.user.create()
box.schema.user.drop()
box.schema.user.grant()
box.schema.user.revoke()
box.schema.func.create()
box.schema.func.drop()

Store space creator in space definition.

What this patch doesn't implement:

- privilege checks in replication
- authentication of replication slaves
- exhaustive test coverage

This patch converts space:iterator() to be compatible with Lua
for-in loop conventions. The most important change is that
generating function now returns *state* as its first result:

    for _state, val in space.index[0]:pairs() do work(val) end

New syntax follows the best practices of Lua community and makes
index API to be more consistent with pairs() and tuple iterators.

This change partially restores pairs() logic as it was implemented
before 49875615.

This patch introduces backward-incompatible changes to select()
and adds couple new methods:

  * index:select(key) -> tuple, tuple, ... was changed to
    index:select(key, opts = {}) -> { tuple } where opts can be

       - iterator = ALL if key == nil or key == {} | EQ otherwse
       - offset = 0
       - limit = unlimited

  * index:get(key) -> tuple | nil | error on more than one tuple
    a wrapper for select() to get the single tuple

  * space:put(tuple) -> tuple
    an alias for space:replace() (to provide integrity with get())

Test suite, box.space and box.net.box API were also updated to
meet changes.

This patch replaces Lua/C bindings to iterator by FFI.

Minor changes - fix msgpack.decode for zero-size arrays and update
line numbers in result files.

Marshall replication using the primary port.

Split iproto requests into two categories: DML and admin.  Change
PING request code to 64, to lay within admin request range.
Perform administrative requests synchronously, without pushing
them into an event queue.
Add a new administrative request, IPROTO_SUBSCRIBE.

Use dynamic memory for struct iproto_request. Introduce memory
management.

Remove replication_port from the configuration file and
update tests.

Fix the test runner so that it correctly generates
replication_source to point to the primary port.
Add variable arguments to IllegalParams.
Move replia-related recovery methods to a new header, replica.h.

Remove a debug printout from box.net.lua

Update tests.

'print_log'`