Merge release back to develop for doc update

[abitmore]

No description provided.

[pmconrad]

I think these numbers are wrong. SSD is only required for ES, for normal nodes a classic HD is sufficient.

Blockchain size is currently about 33G, don't know why you specify different HD sizes. Logfiles?
Minimal node should work in 4 GB I think (no history).

[oxarbitrage]

This is recommended sizes.
Even for ES node HD will do the job but slower(there are public mainnet elastic nodes with HD).
Eventually we will suggest SSD everywhere to make a sync in a reasonable time. Right now i think we can change to HDD Default and Minimal. In minimal we can change back to 4G in RAM.
Disk size of 80G is ok if the chain is 33G, this should be the size of disk someone should purchase to run it, so considering OS and other tools 80G sounds reasonable or at least 60G.

[oxarbitrage]

We can also add block producer node to the table.

[cogutvalera]

@oxarbitrage is right !
We need both API and Witness nodes requirements information IMHO, would be very helpful really !

[pmconrad]

Block producers and seed nodes can run minimal configuration. Witness plugin does not require meaningful additional RAM.

[pmconrad]

Sync is bounded by network, not by HD speed. IMO. No need to recommend SSD.

[oxarbitrage]

Ok, still for ES SSD is faster and the network is the same. Anyways, added this #1380 and also #1379 to update the date of the info.

Pretty nice that the pulls to master and develop will include this commits if we merge them to release, no need for opening new pulls.

[abitmore]

I think full nodes should be run on SSD to increase startup/shutdown speed.

By the way, I've wrote a few commit comments about reasoning when adding the numbers, although the extra spaces are arbitrary.

On 2018-10-15,
* block file (plus index) is around 35G;
* on-disk object database is around 1/5 of RAM used;
* default p2p logs are around 12G (level = warn, keep 7 days);
* console logs and rpc logs are relatively small.