Index performance optimizations (REPLACE: TREE up to 90%, HASH up to 10%)
asio: libeio import and wrapper implementation.
asio: init and free added to bootstrap.
Refactoring: space_replace, index_replace and txn_replace methods
txn_rollback fix
Minor fixes in space_replace, index_replace and txn_replace methods
Remove BOX_ADD and BOX_REPLACE from space.m, index.m, tree.m
libeio: review fixes
Reworked box.unpack
box-unpack: minor edits
Merge branch 'box-unpack-reviewed'

Conflicts:
	test/box/lua.result
coeio: asio refactoring and review fixes.
Merge branch 'coeio'
Add box.time() and box.time64() needed by queues.
New debian package
Tests for space_replace
index-speedup: code review.
Tests for space_replace 2
Remove index::findByTuple method
Remove index::findUnsafe method