Resolved the license mess

README

@@ -3,7 +3,7 @@ OpenSCAD MCAD Library
 
 This library contains components commonly used in designing and moching up mechanical designs. It is currently unfinished and still undergoing considerable API changes however many things are already working.
 
-This library currently has code licensed under the GPL 3.0 and GPL 2.0, please check the files for compatibility. This is to be remedied somehow soon.
+This library is licensed under the GPL 2.0.
 
 Currently Provided Tools:
 

bearings.scad

@@ -1,3 +1,5 @@
+// License: GPL 2.0
+
 //Todo: placeholder; should generate standard + cusom bearing mounting holes
 module bearing_hole(outer_radius, hole=true, mochup=true)
 {

motors.scad

@@ -1,3 +1,5 @@
+// License: GPL 2.0
+
 include <math.scad>
 
 
@@ -89,4 +91,4 @@ module _stepper_motor_mount(
 		}
 	}
 	};
-}
+}

nuts_and_bolts.scad

@@ -1,3 +1,5 @@
+// License: GPL 2.0
+
 //testNutsAndBolts();
 
 module testNutsAndBolts()
@@ -176,4 +178,4 @@ module boltHole(size, units=MM, length, tolerance = +0.0001, proj = -1)
 			square([capRadius*2, capHeight]);
 		square([radius*2, length]);
 	}
-}
+}

screw.scad

@@ -1,5 +1,5 @@
 // Parametric screw-like things (ball screws, augers)
-// It is licensed under the GNU GPL 3.0 license.
+// License: GNU GPL 2.0 or later.
 // © 2010 by Elmo Mäntynen
 
 include <curves.scad>