Update to daily Hivemind snapshots

I distribute daily Hivemind database dumps in the last 5 months. The format of the dump was traditional in that timeframe. In order to optimize restoring time on fresh installs, I have switched it to the custom dump format.

This format is compressed by default and allows concurrent dump/restore actions. On my tests, rebuilding a fresh Hivemind into the latest head block took me 2.5 hours. (Including the download time.)

Steps to restore the database are the same except the restoring command.

Now, you can restore the database with

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pg_restore -j 8 -U <db_user> -d <db_dump> hive_latest.dump

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-j stands for thread count. I have aligned it with my core count in my test.

Also, worth noting that the dump is taken from a PostgreSQL 10.8 server. It may not be compatible with other PostgreSQL versions.