Removing offset2 from Perl bindings and other minor cleanup.

src/libslic3r/Geometry.cpp

@@ -1083,8 +1083,7 @@ MedialAxis::process_edge_neighbors(const VD::edge_type* edge, ThickPolyline* pol
     }
 }
 
-bool
-MedialAxis::validate_edge(const VD::edge_type* edge)
+bool MedialAxis::validate_edge(const VD::edge_type* edge)
 {
     // prevent overflows and detect almost-infinite edges
 #ifndef CLIPPERLIB_INT32

src/libslic3r/PNGReadWrite.cpp

@@ -103,6 +103,7 @@ bool decode_png(IStream &in_buf, ImageGreyscale &out_img)
 // Down to earth function to store a packed RGB image to file. Mostly useful for debugging purposes.
 // Based on https://www.lemoda.net/c/write-png/
 // png_color_type is PNG_COLOR_TYPE_RGB or PNG_COLOR_TYPE_GRAY
+//FIXME maybe better to use tdefl_write_image_to_png_file_in_memory() instead?
 static bool write_rgb_or_gray_to_file(const char *file_name_utf8, size_t width, size_t height, int png_color_type, const uint8_t *data)
 {
     bool         result       = false;