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This fixes the following bugs:

- 1st and 2nd ext fcn deriv nodes were incorrectly added to
  DataTree::external_function_node_map, because of the chaining of
  constructors.

- the following methods of FirstDerivExternalFunctionNode were not overloaded:
  toStatic(), buildSimilarExternalFunctionNode()

- the following methods of SecondDerivExternalFunctionNode were not overloaded:
  toStatic(), buildSimilarExternalFunctionNode(), compile(),
  compileExternalFunctionOutput()

Since the method was not implement, the method of the parent class was used.
This was leading to wrong results in the context of Ramsey Policy (basically
derivative operators on external functions were dropped from FOCs).

Fixes #598

Closes #624

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

Also rename DynareOutput.hh to FileOutputType.hh. Include the latter in dist
tarball, and add copyright/license header.

Closes #556

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

steady_state_model

This reverts commit 2568e87b4394961fed1da7d2337d6cae637b4166.

to change ModFile::c_driver mechanism

Houtan Bastani authored Aug 06, 2013 and MichelJuillard committed Feb 24, 2014

Conflicts:
	preprocessor/ComputingTasks.cc
	preprocessor/ComputingTasks.hh
	preprocessor/ParsingDriver.cc

Houtan Bastani authored Aug 06, 2013 and MichelJuillard committed Feb 24, 2014

Conflicts:
	preprocessor/ComputingTasks.cc
	preprocessor/ComputingTasks.hh

Houtan Bastani authored Aug 06, 2013 and MichelJuillard committed Feb 24, 2014

Conflicts:
	preprocessor/DynareMain2.cc
	preprocessor/ModFile.cc
	preprocessor/ModFile.hh
	preprocessor/Statement.hh

Should fix crashes on models with leads/lags of more than one on exogenous.

Closes #617

Ref #267