Write code to detect ill-conditioning in the FE model.

[lcpt]

Sometimes is not trivial to detect where is the problem that causes the solver to crash or, for example, when performing geometrically non linear analysis with loose cables we can find nodes that are almost free.

That will be useful to write the routines to detect this problem based on something like this: http://eprints.ma.man.ac.uk/1997/1/covered/MIMS_ep2013_35.pdf

(Detecting the Causes of Ill-Conditioning in Structural Finite Element Models) by Kannan, Ramaseshan and Hendry, Stephen and Higham, Nicholas J. and Tisseur, Francoise

[lcpt]

We have made some progress but there is still some work to do.