* passing env to phia_getstring() does not work any more

Split keys by '.' to make output to be more YAML-friendly.

- Export phia_index_new(env, key_def) API
- Remove phia_configure() and phia_configure_storage()
- Remove se_confdb

Implementation already was removed from phia.c.

- Move start/stop hooks to coeio.c
- Don't invoke on_stop hook if on_start has failed

`tarantoolctl connect <URI>` connects to a remote tarantool
instance, specified by URI and opens an interactive console
session.

Unlike other tarantoolctl subcommands it doesn't operate on
instance names.

Fixes #1288

* remove so_free() from sophia object API

* use more verbose names

ssblob was used only for in-memory mode and can be safely removed.

* se_of()
* phia_document_setobject()

The generic, type-unsafe API is used for stream merges only.
Don't use it in places in which it obscures the code.

Macros make it difficult to navigate around the code, tags or not.