Fixed ls2003.mod for testsuite

are no missing observations

question about the list of endogenous variable to analyze in estimation

corresponding seemingly useless code

The bug in the graphics code is fixed in Octave 3.4.
Closes: #212

These functions were saving the whole workspace (with a "save" command). This
workspace includes a function handle which Octave does not know how to save.
The quick fix was to remove these "save", since they also harm performance and
are only useful for debugging purposes.