Merge remote-tracking branch 'origin/1.7' into phia-vindex-refactor-v3

doc/sphinx/book/administration.rst

doc/sphinx/book/app/c-lua_tutorial.rst

doc/sphinx/book/box/box_index.rst

doc/sphinx/book/box/index.rst

doc/sphinx/dev_guide/building_documentation.rst

doc/sphinx/dev_guide/documentation_guidelines.rst

doc/sphinx/dev_guide/index.rst

doc/sphinx/reference/console.rst

doc/www/content/newsite/careers.yml

doc/www/content/newsite/index.yml

doc/www/theme/static/design.css

doc/www/theme/templates/index.html

src/box/box.cc

src/box/cluster.h

src/box/key_def.h

src/box/phia.c

src/box/vclock.h

src/lib/bitset/bitset.h

src/lib/salad/rtree.h

src/lib/small