a modified version of official-melminter; add some usual features.

overview of mel-mint starters: 1. you enter a threads number --threads (or auto), and give a destination of your mints --payout ; and melminter will create a minting-wallet for itself (default path: ~/.config/melminter/ for Unix-like. ~~or micro$oft window$ user %appdata%/melminter/~~), but you can manual use option --daemon and the program will connecting that IP address (not start one itself), and use melwalletd options --wallet-dir for which path you like. 2. and... for now... (if you are a new member) need some small > 0.05 MEL to seeding your incomes, if you does not have balance: please join the Discord community to get your first airdrop 1.00 MEL; because themelio mint needed to pay for network transaction fees, hope this issue will resolved at future... ; if you make sure have some but less than 0.05 and if you still want to minting, please see this option --skip-amount-check [Note: for now this cannot make it fee-less, the program will stopping work with zero balance] 3. now you can starting your minter program, and to get your first ERG(s). (note: for all arguments please use melminter --help for official program, or melminter-mod for this one)

then to looks the mint how works: 1. first spawn N threads for minting, and send a single transaction to blockchain network (aka the "new-coins" or "new-denoms": for tell network nodes "your mint has been started for now"), the amount of "new-coins" should equal to your threads number. 2. then drink a cup of coffee or tea, minter program will running a long time (usual 12 hours) for DOSC, the proof of seq work (PoSW). and once the computing completed, submit your proof to the melnet (aka DoscMint transactions), these Mutli-transactions number about to how many threads started. so it will generate N transactions for each thread to proof it's work. these transactions spent the 90% of network fees because them too much big size. if the 12 hours too long for you, then you need to lower the difficulty using --fixed-diff option. but notice if you specify a too small one, then your coins will lost as result. 3. and wait one minute, you should get a lot of ERG, a temporary assets it means how many works finish. then the end, initial a mel-swap for converting your all ERG to MEL (the stablecoin of themelio). how many MEL you got? it's about to the current exchange rate of ERG/MEL pair. for now (2022-07-30), 1 MEL = 2.5233 ERG... you can looks the rate use melwallet-cli pool ERG/MEL or visit explorer: https://scan.themelio.org