Corrections spotted by tests

gears.scad

@@ -1,6 +1,6 @@
 //test_involute_curve();
-test_gears();
-demo_3d_gears();
+//test_gears();
+//demo_3d_gears();
 
 // Geometry Sources:
 //	http://www.cartertools.com/involute.html

involute_gears.scad

@@ -32,7 +32,7 @@ module test_bevel_gear_pair(){
 
 module test_bevel_gear(){bevel_gear();}
 
-bevel_gear();
+//bevel_gear();
 
 pi=3.1415926535897932384626433832795;