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Continue harmonizing figure titles in GSA

Clean up steady state file examples/NK_baseline_steadystate.m to make it...

Also shows how to use file to impose restrictions using the check indicator

- rename ExprNode::collectVariables in ExprNode::collectDynamicVariables
- new ExprNode::collectVariables: same as above, but without lag information
- remove ExprNode::findUnusedEndogenous: essentially redundant with the above)
- remove ExprNode::collectModelLocalVariables: idem

Refuse that estimated parameters appear in the expressions defining the variance/covariance matrix of shocks

Closes #469

Fixed bug in Matlab unitary tests. Wrong dimension for returned infor variable (missing column for execution time).

Correct name of output folder in writing TeX-Code

csv2cell from octave-io package has a bug (in versions < 1.2.2): it enters an
infinite loop when reading CSV files without a newline at the end.