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.
fix typo
implement "caught-up" logic for LLSR

This lets walsender terminate nicely when a signal from postmaster
arrives.
random cleanups
add support for wal_sender_timeout