First phase of Unicode polishing: replace the edit box with a combo

box. Also default to ISO8859-1 so that CSI works in the default
mode; this is ridiculously Western-centric but I can't honestly
think of a better option.

[originally from svn r1183]

putty.h

@@ -510,6 +510,7 @@ void lpage_send(int codepage, char *buf, int len);
 void luni_send(wchar_t * widebuf, int len);
 int check_compose(int first, int second);
 int decode_codepage(char *cp_name);
+char *cp_enumerate (int index);
 char *cp_name(int codepage);
 
 /*