reverts commit 19343e71

Make box.slab.stats() output CALL compatible.

Reflect in slab stats the quota size and index memory statistics.

arena_used_ratio - how much of arena is used
items_used_ratio - how much memory is actualy used for items,
given that there is some fragmentation. Doesn't reflect index pages
arena_used - how much of the quota is used (i.e. how much memory
is used for index and tuple data)
arena_size  - this is the same as box.cfg.slab_alloc_arena.
quota_size - how much of the quota is defined (box.cfg.slab_alloc_arena)
quota_used - how much of the quota is used (reflects the memory taken
by all slabs, including slabs in caches)

Incompatible change:
Extract detailed slab statistics to a separate call, box.slab.stats()

Any function of Lua log module would first evaluate the call stack,
and only then invoke the logger function -- even if the text is
then sent to /dev/null because log level is too low.

Short cut the log call in case the log level is low and the message
is muted.

When selecting the next buffer to flush, take into account not
just its size, but how much of it has already been flushed.
This saves a couple syscalls per connection per event loop.

Display how much memory is used by a fiber, and the total size.

1)removed atfork xlog resources freeing - they could be corrupted but xlog thread
2)snapshot.test now use pcall(box.snapshot) for deterministic code flow

Iproto + wal permission test case
Wal writer bug fix port from 1.6.6

remove unused config

fixed gh-731 : now every rtree has it's own matras instance that is destroyed with rtree, releasing all memory of tree instance

gh-613 replication conflict test cases

gh-613 after review fixes

microsleep for CRDT test case, test-run updated

CRDT fix

*)added strnptr (str+len=>ptr) mhash instaniation into assoc lib

Don't malloc(), this code should never be used for unbounded
sizes.

- add a test case for authentication trigger
- pass user name to the trigger
- invoke trigger before the current user has been changed
- after review fixes

Implement basic support for stored functions in C/C++.

- split away struct func from struct func_def (function
object and function definition object).
- extend box.schema.func.create() to accept 'language' argument.
- move module API related cmake magic to its own file
- add test/lib to gitignore
- update to the new test-run
- add a test

Replace socket('AF_UNIX', 'SOCK_STREAM', 'ip') with
        socket('AF_UNIX', 'SOCK_STREAM', 0).

Fixes distributions with missing "ip 0 IP" line in /etc/protocols
(e.g. Arch Linux).

In case output is multiplexed, obuf_rollback_to_svp could
roll back to a very early  in the output buffer, since
svp is taken before a possible yield.

This is a regression introduced in the patch which
removes iproto_port from Lua calls.

Test case

vclock_get() can return -1 in this case.
Probably introduced by 311551f9

Push a workaround for infinite loop in backtarce_foreach() when
fiber == self: do not try to print trace of the current fiber.

*) fixed potentionally unsafe code:
  on memory fail there could be port->found > 0 and uninitialized port->svp

 on memory fail there could be port->reply.found > 0 and uninitialized port->svp,
 that could lead to random error after svp restoration.
*) possibly fixed OPENTAR-97

 *) added stress test for snapshotting
 *) moved finalizers.test.py to long_run

closes gh-856

Rename global `fiber` into `fiber_ptr` (for use with gdb and avoidance of ambiguity with `struct fiber`)