GRAPH NOW AVAILABLE!! YAY! :D

We now have a fully working graph!!!
However, axes still have to be named and graph value-to-scale ratio has
to be fixed.

APPROACHING Application Completion!! :D

Implementations:
+ Show workout graph button
+ XML Graph (xml copy pasta peace of code)
+ kmPerHour calculating method (sofisticated method, took me a long
while on this one)