Removing offset2 from Perl bindings and other minor cleanup.

lib/Slic3r/Geometry/Clipper.pm

@@ -5,7 +5,7 @@ use warnings;
 require Exporter;
 our @ISA = qw(Exporter);
 our @EXPORT_OK = qw(
-	offset offset2 
+	offset 
 	offset_ex offset2_ex
     diff_ex diff union_ex intersection_ex 
     JT_ROUND JT_MITER JT_SQUARE 

lib/Slic3r/Print/Object.pm

@@ -7,7 +7,7 @@ use List::Util qw(min max sum first);
 use Slic3r::Flow ':roles';
 use Slic3r::Geometry qw(scale epsilon);
 use Slic3r::Geometry::Clipper qw(diff diff_ex intersection intersection_ex union union_ex 
-    offset offset2 offset_ex offset2_ex JT_MITER);
+    offset offset_ex offset2_ex JT_MITER);
 use Slic3r::Print::State ':steps';
 use Slic3r::Surface ':types';