more parameter refinements

pandaapp/src/indexify/indexify.cxx

@@ -157,6 +157,12 @@ Indexify() {
      "concatenated with a frame number.",
      &Indexify::dispatch_none, &caption_frame_numbers);
 
+  add_option
+    ("font", "fontname", 0,
+     "Specifies the filename of the font to use to generate the thumbnail "
+     "captions.",
+     &Indexify::dispatch_filename, NULL, &_font_filename);
+
   add_option
     ("fontaa", "factor", 0,
      "Specifies a scale factor to apply to the fonts used for captioning "
@@ -166,15 +172,9 @@ Indexify() {
      "should be a number in the range 3 to 4 for best effect.",
      &Indexify::dispatch_double, NULL, &_font_aa_factor);
 
-  add_option
-    ("font", "fontname", 0,
-     "Specifies the filename of the font to use to generate the thumbnail "
-     "captions.",
-     &Indexify::dispatch_filename, NULL, &_font_filename);
-
   add_option
     ("thumb", "x,y", 0,
-     "Specifies the size in pixels of thumbnails.",
+     "Specifies the size in pixels of the thumbnail images.",
      &Indexify::dispatch_int_pair, NULL, &thumb_width);
 
   add_option
@@ -185,12 +185,13 @@ Indexify() {
 
   add_option
     ("space", "x,y", 0,
-     "Specifies the x,y spacing between thumbnails in pixels.",
+     "Specifies the x,y spacing between thumbnail images, in pixels.",
      &Indexify::dispatch_int_pair, NULL, &thumb_x_space);
 
   add_option
     ("index", "x,y", 0,
-     "Specifies the size in pixels of the index images.",
+     "Specifies the size in pixels of the index images (the images that "
+     "contain an index of thumbnails).",
      &Indexify::dispatch_int_pair, NULL, &max_index_width);
 
   add_option