Added Pronterface desktop entry file and associated shell script. Another workaround. This time, the desktop file executes the bash script, which changes the working directory to the Printrun directory before executing the pronterface.py Python script. This is necessary because the pronterface.py file must be run with the working Printrun directory in order to access the local .pronsolerc file (not to be confused with the 2nd choice global .pronsole file). Desktop entry files do not support cd, which necessitates the use of the bash script.