re-added spider import for 2D files

modules/io/src/img/map_io_spi_handler.cc

@@ -152,7 +152,7 @@ void prep_header(spider_header& header, const img::Size& size, const geom::Vec3&
   String date_for_header=time_string.substr(8,2) + "-" + time_string.substr(4,3) + "-" +
                          time_string.substr(22,4) + " ";
   String time_for_header=time_string.substr(11,8);
-  String title_for_header = "Generated by OST (www.img.org)";
+  String title_for_header = "Generated by OST (www.openstructure.org)";
 
   header.fNslice = nslice;
   header.fNrow = nrow;
@@ -274,8 +274,8 @@ void header_filler(std::istream& in,  spider_header& header)
   f.read(header.szITit,160);  
 
 
-  if(header.fIform!=3.0) {
-  throw(ost::io::IOException("spiderRead: can only read 3 (3D volume)\n"));
+  if(header.fIform!=3.0  && header.fIform!=1.0) {
+  throw(ost::io::IOException("spiderRead: can only read modes 1 (2D image) or 3 (3D volume)\n"));
   }
 
 }