Friendly Graphical Shortest Path.

Design and implement a program that accepts from the user the name and
state of two places in North America. It must look these places up in 
the named-places file (as in assignment 2, the hash table) to discover
their closest locations in the intersections file and their longitudes
and latitudes.

It must then scan this map coverage list
     http://rabbit.eng.miami.edu/geographical/bintiles/coverage.txt
to find the smallest map tile that covers both places.

  (You can't open a URL in C++ as though it were a file. You'll
   need to download the file to the computer you are using)

  (The information on each line is the range of latitude, followed
   by the range of longitude, followed by the file name)

When the correct map tile file is selected, your program should open
a graphics window of the right size, and draw the map nicely, in colours
that reasonably represent altitude. Remember these are binary files.
You must use the standard C++ library methods for reading the file,
not the older C functions.

The individual map tile files are here:
     http://rabbit.eng.miami.edu/geographical/bintiles/
In that folder, one of the first links is to a file called "all.zip",
which contains all of the map files compressed together, so you don't
have to download them all individually. The zip file is about 42 MB long.

Now your program must find the shortest route between the two locations, 
and draw it on the map.

Also the program should print helpful driving instructions. The exact format
is up to you, but it should be something along these lines:

  Go North on I-95 for 52 miles to near Pompano Beach
  West on FL-814 for 6 miles to near Margate
  North on FL-817 for 2 miles to Coral Springs, your destination.

Note that long roads are split up into small segments. We don't want to see

  North on I-95 for 1.5 miles
  North on I-95 for 2.1 miles
  North on I-95 for 1.3 miles
  North on I-95 for 0.7 miles
  North on I-95 for 1.0 miles

Wait until there is a change, and just output (for that example)

  North on I-95 for 6.6 miles

The files containing the roads and intersections are of course the ones
we examined in class 11, links to them and a reminder of
their format are in the class notes for that day.

You may #include <vector> if you haven't got a good working implementation
of your own. Any other STL include, ask me about it first. In particular,
you may have trouble if you try to use the library priority queue. Don't
use it.

Turn in a single document (that probably means word) containing all of
your code, clearly readable in a sensible fixed-width font, any special
instructions or explanations, and a screen-shot or two demonstrating it.


Summary:
  1. Find two places selected by user
  2. Find map tile that covers both of them
  3. Find shortet route between them
  4. Draw shortest route on map
  5. Print driving instructions
  6. Make it look good in a single document