Update temoa_lib.py

Fan: The "l_total" should be replaced with "total".
Kevin: "It would appear that I forgot to 
change that line when I made a variable name change last November:   
https://github.com/hunteke/temoa/commit/c070fd46a6f75261da192f4b3c6c7dacd09ad8d2 
This underlies the fact that at present we do not have a comprehensive test suite in place.  (I suppose it's difficult to motivate one's self to do the necessary work on this front as it is inglorious and I cannot apply it as evidence for the degree!) "