Faster support generation. Includes a new implementation of the Douglas-Peucker algorithm

lib/Slic3r/Polygon.pm

@@ -109,7 +109,6 @@ sub subdivide {
         my $len = Slic3r::Geometry::line_length([ $self->[$i-1], $self->[$i] ]);
         my $num_points = int($len / $max_length) - 1;
         $num_points++ if $len % $max_length;
-        next unless $num_points;
         
         # $num_points is the number of points to add between $i-1 and $i
         my $spacing = $len / ($num_points + 1);