[Groff] CVS diff for tbl expanded column enhancement

[Steven Starr]

All:

I have attached for review the CVS diff for the three files that I
modified to implement the expanded column feature for tbl. This feature
was present in the last AT&T release of DWB (troff, tbl, etc).

This is the description of that feature (trivially modified).

"A key letter may be followed by the letter "y" or "Y" to indicate an
expanded column. If the modifier is used, the width of the corresponding
column will be increased to use the remainder of the line length after
the widths of the other columns have been calculated. This feature is
useful for a column containing text blocks where it is desired to make
the column as wide as possible without exceeding the line length. Only
one expanded-width column is permitted for each table, so this modifier
is limited to a single column in each table."

The AT&T version used the key letter modifier "x" or "X" to
specify which column was to be expanded, but since in tbl 1.19.1
the "x/X" modifier has been consumed to support user-defined
macros, I implemented it using the key letter "y/Y".

Steven Starr

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groff.diff
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