Defined the +-* operators on Pointf.

Removed the deprecated VibrationLimit feature.
Added triangle infill.
The Prusa3D fork of Slic3r has been marked as "Slic3r Prusa Edition"
with menus pointing to the prusa3d/slic3r github release page
and Prusa3D drivers downloads page.

lib/Slic3r.pm

@@ -11,6 +11,7 @@ use warnings;
 require v5.10;
 
 our $VERSION = VERSION();
+our $FORK_NAME = FORK_NAME();
 
 our $debug = 0;
 sub debugf {
@@ -67,7 +68,6 @@ use Slic3r::GCode::MotionPlanner;
 use Slic3r::GCode::PressureRegulator;
 use Slic3r::GCode::Reader;
 use Slic3r::GCode::SpiralVase;
-use Slic3r::GCode::VibrationLimit;
 use Slic3r::Geometry qw(PI);
 use Slic3r::Geometry::Clipper;
 use Slic3r::Layer;