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

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