ltlcross: end CSV lines with \n, not \r\n

* src/bin/ltlcross.cc (print_stats_csv): Revert the recent
addition of \r, it is caussing too many issues.
* NEWS: Mention it.

NEWS

@@ -37,7 +37,12 @@ New in spot 1.2a (not released)
             http://spot.lip6.fr/userdoc/csv.html
       for some discussion and examples of the last few features.
   * Bug fixes:
-    - ltlcross' CSV output now stricly follows RFC 4180.
+    - ltlcross' CSV output has been changed to be more RFC 4180
+      compliant: it no longuer output useless cosmetic spaces, and
+      use double-quotes with proper escaping for strings.  The only
+      RFC 4180 rule that it does not follow is that it will terminate
+      lines with \n instead of \r\n because the latter cause issues
+      with a couple of tools.
     - ltlcross failed to report missing input or output escape sequences
       on all but the first configured translator.
 

src/bin/ltlcross.cc

@@ -1535,18 +1535,18 @@ print_stats_csv(const char* filename)
 
   *out << "\"formula\",\"tool\",";
   statistics::fields(*out, !opt_omit, has_sr);
-  *out << "\r\n";
+  *out << '\n';
   for (unsigned r = 0; r < rounds; ++r)
     for (unsigned t = 0; t < ntrans; ++t)
       if (!opt_omit || vstats[r][t].ok)
 	{
-	  *out << "\"";
+	  *out << '"';
 	  spot::escape_rfc4180(*out, formulas[r]);
 	  *out << "\",\"";
 	  spot::escape_rfc4180(*out, translators[t].name);
 	  *out << "\",";
 	  vstats[r][t].to_csv(*out, !opt_omit, has_sr);
-	  *out << "\r\n";
+	  *out << '\n';
 	}
   delete outfile;
 }