[bug #52463] anything that talks to standard error should identify itself

[G. Branden Robinson]

Follow-up Comment #8, bug #52463 (group groff):


commit 3accb8772240c4a604527d50d78c74147062b51f
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Wed Sep 11 01:55:09 2024 -0500

    [pre-grohtml]: Improve diagnostic messages.
    
    * src/preproc/html/pre-html.cpp: Improve diagnostic message handling.
      (html_system)
      (imageList::createPage)
      (imageList::createImage)
      (set_redirection)
      (save_and_redirect)
      (print_args [DEBUGGING]): Prefix output to standard error stream with
      name of program.
    
      (html_system [DEBUGGING])
      (imageList::createPage [DEBUGGING])
      (imageList::createImage [DEBUGGING])
      (print_args [DEBUGGING]): Prefix output to standard error stream with
      "debug:" message severity tag.
    
      (main): Assign to `program_name` global variable before emitting first
      diagnostic ([CAPTURE_MODE]), and convert that diagnostic to use it.
    
    Continues fixing <https://savannah.gnu.org/bugs/?52463>.
    
    Also use stdio functions more economically.  Don't call `fprintf()` when
    we don't need to _format_ a string.




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