Instead of replicating a subset of libsystemd's sd_notify(3) internally,
use the dynamic library provided by systemd to communicate with the
service manager.

When systemd supervision was auto-detected or configured, communicate
the actual server status (i.e. "Loading dataset", "Waiting for
master<->replica sync") to systemd, instead of declaring readiness right
after initializing the server process.

Module API: add support for long double conversions and replies

rename RN_SetLRUOrLFU -> RM_SetLRU and RN_SetLFU

Redis sentinel kill pubsub client connections as well

fix leak in module api rdb test

Update adlist.h

Improve RM_Call() errno classification.

aof: fix assignment for aof_fsync_offset

test infra: improve prints on failed assertions

expires & blocking: handle ready keys as call()

RM_Call() will now use EBADF and ENONET in addition to EINVAL in order
to provide more information about errors (i.e. when return value is
NULL).

Added scan implementation to module api.

module docs, missing LOADING flag

Add RM_ModuleTypeReplaceValue.

Redis Module API calls to allow re-use of data type RDB save/load.

Slightly more efficient RM_ReplyWithEmptyString

XADD with ID 0-0 stores an empty key

Update mkreleasehdr.sh

fix date +%s errata

trimming talk about RESP protocol from API docs (should be independent to that anyway)