gnuplot_scripts: Prepare scripts for upload

Gnuplot scripts will now be automatically published on commons file
description page

gnuplot_scripts/Euro_exchange_rate_to_TRY_-_Turkish_Currency_and_Debt_Crisis_2018.plt

@@ -1,8 +1,6 @@
+#!/usr/bin/env gnuplot
 # based on code of [[User:Gorgo]]/[[:c:File:Euro exchange rate to TRY.svg]]
 
-# gnuplot script for plotting eurofxref-hist.csv as obtained from
-# http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html
-
 infile=system("echo $INFILE")
 outfile=system("echo $OUTFILE")
 

gnuplot_scripts/Euro_exchange_rate_to_TRY_6000px_wide.plt

@@ -1,8 +1,6 @@
+#!/usr/bin/env gnuplot
 # based on code of [[User:Gorgo]]/[[:c:File:Euro exchange rate to TRY.svg]]
 
-# gnuplot script for plotting eurofxref-hist.csv as obtained from
-# http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html
-
 infile=system("echo $INFILE")
 outfile=system("echo $OUTFILE")
 

gnuplot_scripts/Euro_exchange_rate_to_TRY_800px_wide.plt

@@ -1,8 +1,6 @@
+#!/usr/bin/env gnuplot
 # based on code of [[User:Gorgo]]/[[:c:File:Euro exchange rate to TRY.svg]]
 
-# gnuplot script for plotting eurofxref-hist.csv as obtained from
-# http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html
-
 infile=system("echo $INFILE")
 outfile=system("echo $OUTFILE")
 

gnuplot_scripts/TRY_exchange_rate_to_EUR_-_Turkish_Currency_and_Debt_Crisis_2018.plt

@@ -1,8 +1,6 @@
+#!/usr/bin/env gnuplot
 # based on code of [[User:Gorgo]]/[[:c:File:Euro exchange rate to TRY.svg]]
 
-# gnuplot script for plotting eurofxref-hist.csv as obtained from
-# http://www.ecb.int/stats/exchange/eurofxref/html/index.en.html
-
 infile=system("echo $INFILE")
 outfile=system("echo $OUTFILE")