[bug #68335] [man] implement new `LS` and `LE` macros for list managment, including inter-paragraph spacing control

Follow-up Comment #5, bug #68335 (group groff):


commit 01c47a6ca8aaad09805821ddd51ab955f4495c25
Author: G. Branden Robinson <[email protected]>
Date:   Sat May 16 18:15:12 2026 -0500

    [man]: Implement `LS`/`LE` indentation management.
    
    * tmac/an.tmac (TP, IP, HP): If macro called in a list context (the
      "list depth" is greater than zero), and an indentation for the current
      list depth is defined, set the prevailing indent to that indentation.
      (We still, and subsequently, override the prevailing indent with the
      indentation argument to these macros, if present.)
    
    * tmac/groff_man.7.man.in (List enclosure macros): Document it.
    
    * tmac/tests/an_LS-and-LE-work.sh: Unit-test effect of list indentation
      on `HP` macro behavior.  Update test expecations of `TP` behavior now
      that indentation is inherited.  Apply a tab-to-space-translating tr(1)
      command on the test output, fearing inconsistencies among Unices in
      how nl(1) prefixes the lines it filters.
    
    Continues fixing <https://savannah.gnu.org/bugs/?68335>.




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