Remove various deficiencies of the manual.

Document bind_ipaddr (lp:bug#1032240).
Separate triggers into an own section.
Clarify that the network now is fully asynchronous.
Clarify how atomicity works in stored procedures.
Provide an overview of possible operations in the data model.
Add a stub for system-specific installation notes.
Fix all references to be stable between builds of the
manual, so that an external link to, say, memcached-protocol
stays valid over time.
Merge branch 'stable'
Fix Bug#1180494 "Concurrent CMake build does not work properly"
Merge branch 'stable'
Continue imporving the manual.

Document in sql.txt what's not available in sql.
Document readahead better.
Document box.selet_limit().
Cross-reference the data model and iterator description.
Document in SAVE SNAPSHOT that a snapshot can be taken
on SIGUSR1, document what WALs can be deleted after a
snapshot is taken.
Improve some wording in replication.
Add server-administration chapter (a stub yet).
Make .tar.gz install described in the tutorial up to
date with the actual .tar.gz install as of today.
Merge branch 'stable'
Documentation: more edits.

Improve wording.
Add links.
Document bitset indexes.
Merge branch 'stable'
crash in c connector (tp.h) when building requests with no inital
buffer (#16)
https://github.com/mailru/tarantool/issues/16
Merge branch 'stable'
Merge branch 'master' of github.com:mailru/tarantool into xml
Test runner: even if yaml parsing fails, write the response out.

Write the test response out even if yaml parser fails.
Merge branch 'stable'
Merge branch 'master' of github.com:mailru/tarantool into xml
box.xml library