bug#6196: 24.0.50; Calc uses invalid gnuplot option

[Štěpán Němec]

`calc-graph-plot' tries to

  "set data style linespoints\n"

but:

        G N U P L O T
        Version 4.4 patchlevel 0
        last modified March 2010
        System: Linux 2.6.32-trunk-686


(the default gnuplot in Debian unstable)

does not recognize this syntax (any more?):


  gnuplot> load "/tmp/calcA909N3j"

  gnuplot> set data style linespoints
             
           "/tmp/calcA909N3j", line 16: Unrecognized option.  See 'help set'.


Changing the above line to

  "set style data linespoints\n"

(which is the current syntax as documented in gnuplot help) fixes the problem.


Štěpán