Update Debugging chapter of Lisp manual.
* doc/emacs/debugging.texi (Debugging): Copyedits. Describe testcover, ERT. (Error Debugging): Note that debug-ignored-errors overrides list values of debug-on-error too. Add xref to Signaling Errors. Note that debug-on-signal is not customizable. Mention condition-case-unless-debug. (Compilation Errors): Node deleted. * doc/emacs/compile.texi (Compiler Errors): Move a paragraph here from deleted node Compilation Errors.
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