Error test from server's responce was added to exceptions.

The function raise_exception was deleted, for exception the function
zend_throw_exception_ex is using.
Now send/recv functions is a part of I/O buffer interface.
Functions read_*_io_buf was moved to io_buf_*.

A fix and a test case for Bug#901674
"No way to inspect exceptions from Box in Lua"

Implenent pcall which works correctly with Objective C
exceptions.

initial implementarion of new php driver.

client/tarantool: proper error display

test/connector_c: sql select limit test
client/tarantool: error processing fix

Continue improving valgrind run: add recommended luajit suppressions.

Workaround a valgrind warning in strtod on 64 bit systems.

On 64-bit systems, strtod uses an optimized version of
strcasecmp to find out whether or not a string represents
a number.

This version uses int (8 byte) comparison. If the string
in turn is less than 8 bytes, or is not aligned around 8 byte
boundary, uninitialized memory can be accessed.

Work this around with a simple test (this is lame and
incomplete, but covers our cases. In future either
this in valgrind will be gone, or our code will change,
or we add a suppression).

Fix a valgrind warning in sptree.h discovered by new tests.

test/connector_c: tnt_reply test added