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This reverts commit 8bc946c148b3e3321e23bfbace19c91feb2893dc.

(commit lost in merge)
(cherry picked from commit d7db5070e7cf8d1b043062b04d3bd3c4e18ce6c1)

- don't emit warnings if the steady_state_model block is not used
- the ramsey_policy check is spurious, there is another one deeper

Closes #556

- allow recursive definitions (Closes #554)
- allow a variable to be defined twice, simply emit a warning (Ref #556)

steady_state_model

- 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

generates <fname>_steadystate2.m returning parameters as well in case
they have been modified by the user. Added several test cases.

Preprocessor: in steady_state_model block, allow MATLAB functions which return several arguments (closes #37)

steady_state_model: authorizing change in parameter values in steady_state_model block + removing ys_ initialization to zero

Steady state file: in the presence of 'ramsey_policy', no longer check that the declarations are recursive, and use input vector of steady state file as initial values