Rename UnitedKingdom.py to Python/UnitedKingdom.py

This is an instantiation of AstroGIS using the text file unitedkingdom.txt as its source of data.  It shows the United Kingdom's boundaries (digitised using Google Maps as a base), and also shows bar graph objects proportional to the sizes of the largest 15 cities in the UK, in order to demonstrate the 3D characteristics of AstroGIS.