Readme file updated with information for syncng a fork to the main repo. after pull request approval.

Other cosmetic changes:
- removal of unused headers;
- space deletion.

README.md

@@ -38,6 +38,16 @@ your changes to the official codebase.
 $ git clone --recursive https://<user>@git.rhrk.uni-kl.de/<user>/dram.vp.system.git
 ```
 
+After a pull request being accepted and merged into the official repository
+you should get your fork updated.
+
+``` bash
+$ git fetch upstream
+$ git checkout master
+$ git merge upstream/master
+$ git push origin HEAD
+```
+
 After cloning go to the project directory.
 
 ``` bash