(list-character-sets-1): New subroutine.
(list-character-sets): Use it. (list-coding-systems-1): New subroutine. (list-coding-systems): Use it. (list-input-methods-1): New subroutine. (list-input-methods): Use it. (mule-diag): Avoid method of displaying text in *Help* then copying it. Instead, insert it directly into *Mule-Diagnosis*. Use list-character-sets-1, list-coding-systems-1, list-input-methods-1. Copy the code from list-fontsets and list-coding-categories. Improve the display buffer's header.
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