Staging the changes to the repository

[arezoorn]

This pull request has the following:

• change to lesson 1 which is the model compile
• change to lesson 2 which is for running the model with respect to the new location of the files.
• Change to Lesson 3 which is about visualization
• Removing all the extra lessons from previous trainings (including calibration/subsetting/physics options)
• Added lesson 4 which is single model run with PESTPP
• Added lesson 5 which is setting up the MC run.