Use a bitmap to represent existing servers.

Fix a typo in panic_on_wal_error initialization for relays.

Fix a bug it reveled: search for the matching vclock
could return no vclock if the first xlog was deleted and
since then we added a new server, and joined immediately
with another replica (init_storage.test.lua details, test case #2)

Conflicts:
	doc/sphinx/book/box/box_index.rst

Conflicts:
	doc/user/stored-procedures.xml

Reorder initialization of yield/rollback triggers.
Add implicit rollback on error in interactive mode, to match
call/eval on a remote host.
Add error injection to tuple allocation code, to be able to
test the case when there is no memory for a new tuple.
Add tests.

Remove regular expressions from console API, they are unacceptably slow.

Add forgotten .result files

This saves one malloc() per channel and tells the GC more
about how much memory is taken by a channel.

tarantoolctl: Don't assume sophia_dir is a subdir of vardir,
create everything on the top level.

tarantoolctl: marginally fix reload, but see gh-824

fio: fix numerous bugs with failure of lua_tostring(), add tests.

A minor style fix, update result file.

* INDEX_EXTENT_SIZE changed back to 16kB

Add tests.

Don't register second-level modules (e.g. box.info) in package.loaded