[task #14986] Match: Include columns with no match in output

[Mohammad Akhlaghi]

Update of task #14986 (project gnuastro):

        Percent Complete:                      0% => 70%                    
             Assigned to:                    None => makhlaghi              

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Follow-up Comment #1:

With Commit 0fc33aa193
<http://git.savannah.gnu.org/cgit/gnuastro.git/commit/?id=0fc33aa193> it is
now possible to construct the output by adding non-matching rows of second
input to all the rows of the first input. Therefore allowing easy merging of
many catalogs into one, without having any repetition.

When both inputs have the same number of columns and same column names and
same column data types (for each same name), it is possibly to simply use
'--outcols=_all' to fully merge non-matching rows of both tables into one.

However, currently, it doesn't allow differing columns: It doesn't add extra
columns to each table (and fill them with blanks where necessary) as Juan had
original proposed. So the task isn't 100% complete.

The most recent Gnuastro book and tarball (that implement this feature) are
available in the links below. For more on this new feature, see the
description of '--outcols' in the Match program of the book below (on page
369-370 as of this commit).

http://akhlaghi.org/gnuastro.pdf
http://akhlaghi.org/gnuastro-latest.tar.lz


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