docs: bring the README up to the wallet that exists, and make -help print (#106)

The README still said deterministic restore was an open issue, told people the mining mode was not remembered between restarts, and wrote every flag in the slash form that MSYS2 turns into a path before the node sees it. Rewritten around the phrase and the file as two backups covering different keys, the -restorephrase note for anyone who made a phrase on 1.2.12, -rescan, the diagnostics report, and the two upgrade reasons measured this week.

Also: -help printed nothing at all. This tree remaps printf to OutputDebugStringF, so the usage page went into debug.log, and a -mwindows binary has no console to write to either way -- the one command whose job is to tell you something returned 0 and said nothing. It now takes the real printf and attaches the terminal. The help text was missing -restoredepth, -showderived and the wallet-hd self-test.

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