Edits of Classes and Functions

- Changed init of Line to use self.calcSlope()
- added level attribute to Limb
- Removed old testing code
- end of averagesForSampleSections now changes averages array where all
values are between -1 and 1
- calculateLimbs now take start and end points (4 ints)
- calculateLimbs has lots of edits
- run() has some automation of creating picture