reverted to pyserial implementation since the pyvisa solution did not allow data to be read from the electronic load
Revert "reverted to pyserial implementation since the pyvisa solution did not allow data to be read from the electronic load"

This reverts commit dfe63582d43f45e9521c888b051d31362dfb3d6c.
Merge branch 'master' of https://github.com/alexoz/MTest
manually copy pasted old mtest code that uses pyserial since I did not want to figure out how to properly do that with git.