Local truncation error

Hi Al,

I'm making some tests using gnucap with power electronic circuits.
I have few questions:
1) Working around inside the code I found that in case the integration 
method used is the Backward Euler, gnucap does not check the LTE.
I do not understand the reason of this choice. Can you spend a minute to 
give me the reason why?
2) What is the exact reason for wich you use a table for selecting the 
actual integration method? An element can impose a particular 
integration which wins over OPT:method? is it correct?
3) Do you plan to improve/modify the model generator (and related 
documentation)?

Thank you in advance

	Dario
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