[bug #42515] clean up macro name spaces regarding "need_eo_{h,tl}"

[G. Branden Robinson]

Update of bug #42515 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #4:


commit 664613412bd99758e31cf46156464474144ade1c
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Wed Jun 16 22:35:57 2021 +1000

    tmac/an-old.tmac: Improve name space usage.
    
    * tmac/an-old.tmac: Properly situate devtag flag-related register names
      in the package name space.  Rename `need_eo_h` to
      `an-devtag-needs-end-of-heading'.  Rename `need_col2` to
      `an-devtag-needs-second-column`.
    
      (an-input-trap, SH, SS, HP, (initialization)): Do it.
    
      (an-input-trap): Test their values more idiomatically.
    
    Fixes one third of <https://savannah.gnu.org/bugs/?42515>.
    
    Problem noted by Werner Lemberg in
    <http://lists.gnu.org/archive/html/groff/2014-01/msg00048.html> (but
    watch out for the Time-Cube-esque URL quoted there).

commit 0c6a585758b923616ee83b1e0c7e185408c6dea8
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Jun 17 02:54:22 2021 +1000

    tmac/e.tmac-u: Rename devtag-related registers.
    
    * tmac/e.tmac-u: Rename registers for clarity.  Unlike other macro
      packages supplied by groff, "me" mostly remains within the AT&T
      2-character name space, accessing extended names selectively through
      `do` and `de1` requests.  The package therefore has no characteristic
      name prefix.
        need_eo_h  -> devtag-needs-end-of-heading
        need_eo_tl -> devtag-needs-end-of-title
        need_tl    -> devtag-needs-title
    
      (@html_check_need_title, sh, EQ): The foregoing registers are
      effectively Booleans, so perform Boolean-style tests on their
      interpolations.
    
    Fixes a second third of <https://savannah.gnu.org/bugs/?42515>.

commit ead1255bd11ae4c4f16e19185a9d301df21f0146
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Jun 17 06:15:36 2021 +1000

    tmac/s.tmac: Rename devtag-related registers.
    
    * tmac/s.tmac: Properly situate devtag flag-related register names in
      the package name space.  Rename `need_eo_h` to
      `s@devtag-needs-end-of-heading'.  Rename `need_eo_tl` to
      `s@devtag-needs-end-of-title`.
    
      ((initialization), par@reset, @SH, par@finish, @NH): Do it.
    
      (par@reset): Test their values more idiomatically.
    
    Fixes last third of <https://savannah.gnu.org/bugs/?42515>.


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