Merge branch 'gh-347-one-based-indexing'

src/box/lua/schema.lua

src/box/lua/space.cc

src/box/lua/tuple.lua

test/big/hash.result

test/big/hash.test.lua

test/big/hash_multipart.result

test/big/hash_multipart.test.lua

test/big/iterator.result

test/big/iterator.test.lua

test/big/lua.result

test/big/lua.test.lua

test/big/lua/bitset.lua

test/big/lua/index_random_test.lua

test/big/lua/utils.lua

test/big/sql.result

test/big/sql.test.py

test/big/tree_pk.result

test/big/tree_pk.test.lua

test/big/tree_pk_multipart.result

test/big/tree_pk_multipart.test.lua