added features of utf-8 descrption

README.utf8

@@ -1,6 +1,6 @@
 use utf-8 for encoding of strings, this enables UNICODE
 international characters sets (of nearly any language)
-in titles, labels, file and folder names.
+in plot titles and labels, file and folder names.
 
 Windows uses utf-16 and conversion functions between utf-8
 and utf-16, if access to Windows API functions is needed.
@@ -14,12 +14,22 @@ ISO-8859-1/ISO-8859-15, that allows extended ascii.
 
 Better looking fonts are now used for labelling the axes.
 
-Variables xbrushwidth and gridwidth (to be set e.g. in
-.spiceinit) allow setting separately the linewidths of the
-graph (xbrushwidth) and the grid (gridwidth).
+Variables xbrushwidth and xgridwidth (to be set e.g. in
+.spiceinit or directly before a plot command) allow setting 
+separately the linewidths of the graph (xbrushwidth) and 
+the grid (xgridwidth).
 
 Slight modification of the Windows GUI string window to
 enhance readability.
 
 Windows GUI is now more responsive during lengthy op
 calculations.
+
+UNICODE in Gnuplot and (limited) in Postscript are supported.
+You will need to download and install gnuplot and a PS viewer
+(e.g. ghostscript, gv or others).
+
+Input files to ngspice now have to be utf-8 encoded. ANSI 
+encoded files will fail (Notepad++ on Windows allows a simple
+conversion). For an ANSI version of ngspice you have to
+compile it with the configure flag --disable-utf8.