[bug #61597] [tbl] support "0" modifier for "|" column classifier

[G. Branden Robinson]

Update of bug #61597 (project groff):

                 Summary: [tbl] change spacing applied to "|" column
classifier and support "0" modifier => [tbl] support "0" modifier for "|"
column classifier

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Follow-up Comment #5:

I'm reducing the scope of this ticket to just the modifier support now,
because of the following recent commit.


commit 8f066786ea3cb5e1dbade1149e7d50ae978da202
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Fri Feb 3 02:22:02 2023 -0600

    [tbl]: Improve symmetry of tables in nroff mode.
    
    * src/preproc/tbl/table.cpp (table::compute_column_positions): If a
      table has "left separation" (it is boxed, or has a vertical rule on
      the left-hand side), increase the first column's start register value
      by 1n, for symmetry with the right-hand size.
    
    * src/preproc/tbl/tests/check-horizontal-line-length.sh:
    * src/preproc/tbl/tests/check-line-intersections.sh:
    * src/preproc/tbl/tests/check-vertical-line-length.sh: Update output
      expectations.
    
    * src/preproc/tbl/tbl.am (tbl_XFAIL_TESTS): Remove now-passing test.
    
    Before:
    
    +--+---+---+
    |a | b | c |
    +--+---+---+
    |d | e | f |
    +--+---+---+
    |g | h | i |
    +--+---+---+
    
    After:
    
    +---+---+---+
    | a | b | c |
    +---+---+---+
    | d | e | f |
    +---+---+---+
    | g | h | i |
    +---+---+---+



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