Rename user_cache_find to user_by_id() to be consistent
with func_by_id(), space_by_id() - API variant which
does not throw exceptions if an object is not found.

Make sure the tests pass under low memory and no memory overcommit.

Add diagrams/rewrite spec. Add snaps/xlog and replication commands overview.

Conflicts:
	doc/user/server-administration.xml

Conflicts:
	src/box/tuple.cc

Conflicts:
	debian/changelog
	debian/control
	debian/rules
	debian/tarantool-lts.lintian-overrides

Minor changes in cmake code style

Conflicts:
	debian/changelog
	debian/control

The bug is already fixed and tests cases are already added.
This patch removes unused fix_lua hack from schema.cc.

0) DIST.LUA: Move dist.lua to tarantoolctl (+ DEB + RPM + DOCS)
0) DIST.LUA: Delete -w option
1) CMAKE: Add pod2man function for generating MAN Files from POD format
2) RPM: Add man files for tarantoolctl, move tarantoolctl+initscripts
from `tarantool` into `tarantool-common`
3) DEB: Remove tarantoolctl.1 creation
4) Remove trailing whitespaces

Fixes gh-570
Fixes gh-557

1) server.get_log(); server.seek_once(msg) -- since we get log object
2) server.logfile_pos.seek_once(msg) -- since the start of server

This patch also fixes incorrect offset calculation in buffer
with multiple responses:

    self.rbuf = string.sub(self.rbuf, off + 1)