Rewrites `README.md` from scratch for #135. Every statement was checked against the code on `next` and against what the built binary prints on small trees under `/var/tmp`. The headings that the code comments cite are kept. Comments in `main_test.go`, `scan_test.go`, `trees_test.go` and `exclude_test.go` cite what the README now says. Where the old text and the repository disagreed, the new text states what the code does: `@latest` installs the newest tagged release, ten million files, no Windows excludes, and an operand reached through a symlinked directory below another operand is dropped (#144). Dropped from "Constraints": the permission to add `github.com/spf13/viper` if configuration-file support is ever needed. Model: fable-5-1
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