Drop hasNext + refactor cursor and feed
Do not use  in the data explorer
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fixing logging of unsanitized string
Added some newline characters to appease the overlords.
Merge branch 'next' into sam_2156_env_stuff
Fix for #2511
Merge branch 'next' of github.com:rethinkdb/rethinkdb into next
Fix for #2511
Merge branch 'v1.13.x' into next
Made make_append, make_terminal, make_to_array, make_eager_terminal, and make_op return a scoped_ptr_t instead of naked allocated pointers.
Made unsharding rget_read_t initialize the global_optargs of the env_t.
Merge branch 'sam_2525' into v1.13.x
Merge branch 'v1.13.x' of github.com:rethinkdb/rethinkdb into v1.13.x
Merge branch 'v1.13.x' into next
Merge branch 'next' into sam_2156_env_stuff
Merge branch 'sam_2156_env_stuff' into sam_2156_env_ii