fix FileName case bug, http://sourceforge.net/p/iso2mesh/code/495/

Author: fangq

savejson.m

@@ -143,10 +143,10 @@
 % save to a file if FileName is set, suggested by Patrick Rapin
 if(~isempty(jsonopt('FileName','',opt)))
     if(jsonopt('SaveBinary',0,opt)==1)
-	    fid = fopen(opt.FileName, 'wb');
+	    fid = fopen(opt.filename, 'wb');
 	    fwrite(fid,json);
     else
-	    fid = fopen(opt.FileName, 'wt');
+	    fid = fopen(opt.filename, 'wt');
 	    fwrite(fid,json,'char');
     end
     fclose(fid);

saveubjson.m

@@ -117,7 +117,7 @@
 
 % save to a file if FileName is set, suggested by Patrick Rapin
 if(~isempty(jsonopt('FileName','',opt)))
-    fid = fopen(opt.FileName, 'wb');
+    fid = fopen(opt.filename, 'wb');
     fwrite(fid,json);
     fclose(fid);
 end