Enhancements and Bug Fixes

This PR bring up the following addition:

• replace smbus with latest smbus2
• removed and replaced buggy print method to generate Gnuplot script with more reliable file method that works with python3/2 seamlessly.

plz redirect me to your code

@AlphaArslan What do you mean by redirect? Do you want to use this PR? If so, then you can clone and install this as follows:

git clone https://github.com/abhiTronix/py-qmc5883l.git
cd py-qmc5883l
sudo pip install .