added a functionality to remove unused dead ends

Author: dkrajzew

docs/ChangeLog.md

@@ -35,7 +35,7 @@
 * Reducing memory footprint and increasing speed
 	* The option **--prunning.remove-geometries** will remove the edge geometries after mapping sources/destiations for reducing the memory footprint; You will be warned, when using in combination with **--direct-output** as this is the only output that needs edge geometries
 	* The computation uses a less complex algorithm when computing unimodal accessibilities
-
+	* Added the option **--prunning.remove-dead-ends** for removing unused dead ends (ones that do not have an origin / a destination)
 		
 ### Continuous Integration 
 

docs/Options.md

@@ -70,6 +70,7 @@ Please note that some options may be defined using an abbreviation; non-abbrevia
 | Option  | Default | Explanation |
 | ---- | ---- | ---- |
 | --prunning.remove-geometries | N/A (optional) | Removes edge geometries. |
+| --prunning.remove-dead-ends | N/A (optional) | Removes dead ends with no objects. |
 
 ## Public Transport options
 | Option  | Default | Explanation |