checkpoint_segments no longer a config option in PostgreSQL 9.5+

[matteopasini]

replace:
s['checkpoint_segments'] = 128 if bulk_load else 64
with:
s['max_wal_size'] = str(3 * (128 if bulk_load else 64) * 16) + 'MB'

[impredicative]

I'm sorry but I don't work with PostgreSQL at this time, and it's not feasible for me to review the change right now. I will however keep the issue open, and will return to it when I work with PostgreSQL again. After you've read this comment, I will mark the repo as Archived.