Increase coins fee_thresholds

[tsusanka]

As a follow-up of #1087 @mmilata made a great research with current fee threshold values of Bitcoin-like coins.

For some of the bitcoin-based coins, the threshold for 250B transaction is following:

Coin	maxfee_kb	fee_threshold	USD rate	fee_threshold (USD)	hard limit (USD)
BTC	2000000	500000 sats = 0.005	11500.0	57.5	575
TEST	10000000	2500000 sats = 0.025	-	-	-
BCH	500000	125000 sats = 0.00125	280.0	0.4	4.0
BTG	500000	125000 sats = 0.00125	10.0	0.01	0.1
DASH	100000	25000 sats = 0.00025	90.0	0.02	0.2
DGB	500000	125000 sats = 0.00125	0.03	0.00004	0.0004
DOGE	1000000000	250000000 sats = 2.5	0.003	0.008	0.08
LTC	40000000	10000000 sats = 0.1	55.0	5.5	55.0
NMC	10000000	2500000 sats = 0.025	0.4	0.01	0.1
VTC	40000000	10000000 sats = 0.1	0.3	0.03	0.3
ZEC	1000000	250000 sats = 0.0025	85.0	0.2	2.0

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Product suggests to set fee_threshold to $10 (and hard limit to $100 then) for all non-Bitcoin coins. For Bitcoin I would like to see some research and maybe we could set it to fivefold the average fee in the last year?

We brought up those numbers without any proper research whatsoever so any feedback is welcomed though. Let's discuss this in Triage.

[tsusanka]

Product suggests to set fee_threshold to $10 (and hard limit to $100 then) for all non-Bitcoin coins.

Is there any hard opposition to this? If not I suggest to do exactly that and leave Bitcoin as is for now cc @prusnak @matejcik.

I think we should do this asap and backport it into the September release - there is #1155 so just to make sure we do not break anything.

@mmilata could you look at this tomorrow?

[mmilata]

@tsusanka sure

[prusnak]

Is there any hard opposition to this?

I am OK with changing the fees for altcoins and not changing the fee values for Bitcoin.

[tsusanka]

@mmilata could you please add Testnet into the table? Obviously without USD columns but it would be helpful to know the threshold also for Testnet.

[mmilata]

@tsusanka added

[tsusanka]

So @sorooris if you send between 0.025 and 0.25 TESTNET fee you should get a warning, if you send over 0.25 you should get an error.

[sorooris]

QA OK
2.3.3 df5421e
Suite 3095a174f258c0226faf2ebcbdda3d8b7f04686f

0.18400039 TEST	0.25551594 TEST

Wallet ec6b4d36cbae2ec1c3f479eb3c1891090790b7c0
Final fee: 100139.73493173493 sat/B
Size: 3.003 kB
Fee: 3.00719624 TEST