[#2] Added Licensing.

I decided on the Apache-2.0 license and have stamped all the files to
now point to that license.

src/bounded.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 /// Primitive types that have upper and lower bounds.
 pub trait Bounded
 {

src/constants.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use std::{f32, f64};
 
 

src/integer.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use crate::number::Number;
 use crate::one::One;
 use crate::zero::Zero;

src/lib.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 //! A mathematical library.
 //! License: Proprietary
 //!

src/line.rs

@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+

src/macros.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 /// A macro that will define a binary operation for
 /// a structure and its components.
 macro_rules! binary_operator_impl

src/matrix.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 //! This module defines the 2x2, 3x3, and 4x4 Matrix structures.
 //use std::ops::{Add, Sub, Mul, Div, Rem, Neg};
 

src/number.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use std::cmp::{PartialEq, PartialOrd};
 use std::fmt::{Debug, Display};
 use std::mem::size_of;

src/one.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use std::ops::Mul;
 
 /// Defines a multiplicative identity element for `Self`.

src/plane.rs

@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+

src/point.rs

@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+

src/quaternion.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 //! This module defines the [Quaternion][1] and
 //! [DualQuaternion][2] structures.
 //!

src/ray.rs

@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+

src/real.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use std::num::FpCategory;
 use std::ops::Neg;
 

src/trig.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 //! This section of the library handles the branch of mathematics
 //! that studies relationships involving lengths and angles of triangles.
 

src/trig/degree.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use std::ops::{Add, Sub, Mul, Div, Rem, Neg};
 use std::ops::{AddAssign, SubAssign, MulAssign, DivAssign, RemAssign};
 

src/trig/radian.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use std::ops::{Add, Sub, Mul, Div, Rem, Neg};
 use std::ops::{AddAssign, SubAssign, MulAssign, DivAssign, RemAssign};
 

src/trig/trig.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use binding::{CDouble, CFloat};
 
 use crate::real::Real;

src/vector.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 //! This module defines 2, 3, and 4 component [Vector][1] structures.
 //!
 //! [1]: https://en.wikipedia.org/wiki/Vector_(mathematics_and_physics)

src/whole.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use super::number::Number;
 
 

src/zero.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Sealed with Magistamp.
+
 use std::ops::Add;
 
 /// Defines an additive identity element for `Self`.