Discrete (XDS) pool miner v5 - 5.0.0 - Windows x64 AVX2

1. Put your XDS payout address (disc1...) in address.txt, nothing else.
2. Run start.bat. The worker name is the computer name.

The miner gets a temporary signing key from the pool and signs locally;
it never needs your wallet, seed or spend key. Rewards are paid to address.txt.

v5 - miner secret: on first start the miner creates miner-secret.key next to
the program (32 random bytes). The pool derives your signing key from it, so
nobody can obtain your key just by knowing your address and worker name.
Keep the file. If you lose it nothing is lost: the miner makes a new one and
the pool gives you a new key; balances belong to your address, not to the file.
Do not share it. To keep it elsewhere: --secret-file PATH.
Miners older than v5 are refused after the date shown on the pool page.
