Disable lens_test example

The node RealLens is missing in the repo..

examples/lens_test.rs

 use opossum::{
-    nodes::{RealLens, Source, Detector},
-    optic_scenery::OpticScenery, error::OpossumError,
+    error::OpossumError,
+    //nodes::{RealLens, Source, Detector},
+    optic_scenery::OpticScenery,
 };
 use std::fs::File;
 use std::io::Write;
 
 fn main() -> Result<(), OpossumError> {
-    let mut scenery = OpticScenery::new();
-    scenery.set_description("Lens Ray-trace test".into());
-    let src = scenery.add_element("Source", Source::default());
-    let l1 = scenery.add_element("Lens 1", RealLens::default());
-    let l2 = scenery.add_element("Lens 2", RealLens::default());
-    let det=scenery.add_element("Detector", Detector::default());
+    // let mut scenery = OpticScenery::new();
+    // scenery.set_description("Lens Ray-trace test".into());
+    // let src = scenery.add_element("Source", Source::default());
+    // let l1 = scenery.add_element("Lens 1", RealLens::default());
+    // let l2 = scenery.add_element("Lens 2", RealLens::default());
+    // let det=scenery.add_element("Detector", Detector::default());
 
-    scenery.connect_nodes(src, "out1", l1, "in1")?;
-    scenery.connect_nodes(l1, "out1", l2, "in1")?;
-    scenery.connect_nodes(l2, "out1", det, "in1")?;
+    // scenery.connect_nodes(src, "out1", l1, "in1")?;
+    // scenery.connect_nodes(l1, "out1", l2, "in1")?;
+    // scenery.connect_nodes(l2, "out1", det, "in1")?;
 
-
-    let path = "lens_system.dot";
-    let mut output = File::create(path).unwrap();
-    write!(output, "{}", scenery.to_dot()).unwrap();
+    // let path = "lens_system.dot";
+    // let mut output = File::create(path).unwrap();
+    // write!(output, "{}", scenery.to_dot()).unwrap();
     Ok(())
 }

src/spectrum.rs

@@ -59,7 +59,7 @@ impl Spectrum {
         })
     }
     /// Create a new [`Spectrum`] from a CSV (comma-separated values) file.
-    /// 
+    ///
     /// Currently this function is relatively limited. The CSV file must have a specific format in
     /// order to be successfully parsed. It must be a file with two columns and `;` as separator.
     /// The first column corresponds to the wavelength in nm, the second columns represent values in
@@ -476,7 +476,7 @@ pub fn create_nd_glass_spectrum(energy: f64) -> Spectrum {
 }
 /// Helper function for adding two spectra.
 ///
-/// This function allows for adding two (maybe non-existing = None) spectra with different bandwidth. 
+/// This function allows for adding two (maybe non-existing = None) spectra with different bandwidth.
 /// The resulting spectum is created such that both spectra are contained. The resolution corresponds
 /// to the highest (average) resolution of both spectra. If one spectrum is `None` the other spectrum is
 /// returned respectively. If both spectra a `None` then also `None`is returned.