Restore proper use of required-components, with explanation
Undo part of 0e0a851b, that changed the keep-operation in invocations of required-components from compile-op to load-op. Explain why in a comment of bundle.lisp: so any compiled file for the component itself be included, which notably matters when using a package-inferred-system. This notably fixes test-bundle.script, test-program.script on mkcl and ecl, and test-concatenate-source.script on ecl. Also simplify the test-bundle support files and remove some warnings.
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