Merge branch '1.7' into 1.7-merge-into-1.8

CMakeLists.txt

cmake/BuildLibGOPT.cmake

extra/exports

src/CMakeLists.txt

src/box/CMakeLists.txt

src/box/alter.cc

src/box/applier.cc

src/box/authentication.cc

src/box/engine.cc

src/box/error.cc

src/box/error.h

src/box/field_def.c

src/box/field_def.h

src/box/func.c

src/box/func.h

src/box/func_def.c

src/box/func_def.h

src/box/index.h

src/box/index_def.c

src/box/index_def.h