bdr: mergme: better background worker name
bdr: mergme: different name for the worker variable in _PG_init
tmp
seqam 0.2
bdr-sequences 0.1
seqam: mergme: remove superflous statement
bdr-sequence: mergme: use consistent order of inserts tablewise

This removes intermittent (detected/resolved) deadlocks between the sequence
manager and logical replication.
bdr: mergme: bdr_seq.c needs to be added to the windows buildsystem.
seqam: mergme: export some functions
wal_decoding: mergme: demote some messages
bdr: sequences: mergme: Support nextval()
bdr: mergme: fix typo
wal_decoding: mergme: implement "caught-up" logic for LLSR

This lets walsender terminate nicely when a signal from postmaster
arrives.
wal_decodign: mergme: Cleanups from Alvaro
wal_decoding: mergme: Cleanups from Alvaro
wal_decoding: mergme: timeout handling
bdr: mergme: Reply to feedback messages

Alvaro
wal_decoding: mergme: Desultory code review in decode.c

Mostly style fixes.  A large function was split.
bdr: mergme: Don't leak a file descriptor in bdr_count_serialize
bdr: mergme: minor tweaks in contrib/bdr