Merge branch '1.10' into 2.0

doc/rfc/template.md

src/box/alter.cc

src/box/index.cc

src/box/index.h

src/box/key_def.cc

src/box/key_def.h

src/box/memtx_bitset.c

src/box/memtx_hash.c

src/box/memtx_rtree.c

src/box/memtx_space.c

src/box/memtx_tree.c

src/box/space.c

src/box/space.h

src/box/sysview_engine.c

src/box/sysview_index.c

src/box/tuple_format.c

src/box/tuple_format.h

src/box/vinyl.c

src/box/vy_log.c

src/box/vy_log.h