Reviewed 2nd chapter in mDSPS, pages={42--72}
Updated script to allow manual inclusion of unchanged files by putting
them in a file 'cf.tex'
Reviewed solution for the 2nd tutorial
(url="https://www.moodle.tum.de/pluginfile.php/299258/mod_folder/content/0/02_Periodic_Signals_and_LSI_Systems_solution.pdf?forcedownload=1")