Change folder structure

[lodersky]

The following folder structure should simplify the use of urbs:

• 'Input' folder contains all input data
• intertemporal input is moved to a subfolder 'Intertemporal' in 'Input'
• single-year input files are moved to 'Input'
• mimo-example is renamed to single-year
• runme is created for intertemporal example and named run_intertemporal.py
• runme is created for single-year example and named run_single-year.py
• runme.py is reduced to a necessary minimum
• file 'data.py' is renamed to 'color-codes.py'