Updating work in the lateral and vertical pressure classes

The methods for the lateral and vertical pressure classes are starting
to be filled in. The files I am using to test are being included, not
sure if anyone is actually interested in that or not.

There is a new addition to what I thought was the 'base set' of files.
The new file is parse.py. The new file is to help take the user input
processing in a new direction. Currently the user input text file would
be parsed by the dispatcher and handler classes but I think there needs
to be some functionality outside of what is currently there.

I have also hit a road block in calculating the lateral pressure when
the original top of grade is sloped. I have an idea how to approach the
problem but I have not confirmed it with an outside source, either
another engineer or a textbook/paper.
Updates

Had some uncommitted updates. Haven't worked on this project in a while.
Ran into a road block; knowledge of the subject ran out and haven't had
time to do more research.