(Fdefine_key): Allow symbol as KEY argument for
defining command remapping. Doc updated. (Flookup_key): Remap command through keymap if KEY is a symbol. (is_command_symbol): New function. (Fkey_binding): Use it. New optional argument NO-REMAP. Doc updated. Callers changed. Perform command remapping via recursive call unless that arg is non-nil. (where_is_internal): New argument no_remap. Callers changed. Call recursively to find original key bindings for a remapped comand unless that arg is non-nil. (Fwhere_is_internal): New optional argument NO-REMAP. Doc updated. Callers changed. Pass arg to where_is_internal.
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