function which generates a matrix from summary(Model), where 'Model' is an 'lm' object. Is used by marima, in case there can be one or more non-identifiable (ar-)parameters when estimating the lm-object.
= an 'lm' object (with NA's for non-identifiable ar.parameters in the 'lm' specification, if so).
Results = matrix with 4 columns containing the same information as summary(Model), but with "NA" rows replaced by rows = c(0, 0, 0, NaN).
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