Testsuite: reorganize for bock and bytecode, using a script for systematically testing options combinations

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- the options "sparse_dll" and "sparse" are no more available. They are replaced by combinations of block (for block decomposition) and bytecode (for model stored in a binary file)
- markowitz is now an option of simul and steady commands


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- normalize an equation linear in its endogenous variable
- Chained rule derivatives (necessary to reduce a block to the feedback equations and variables)

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- SymbolGaussElim.cc is discarded from the preprocessor (all simulations are now implemented in simulate)
- Correction in model_info.m

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- Pound expressions accepted with sparse option


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- lead and lag on exogenous variables
- corrections in dr1_sparse and dr11_sparse
- minor corrections in simulate

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- Implementation of the simulation of the block decomposed model using sparse matrix using MATLAB code: 
  New option in model : sparse
  Example:
  Model(SPARSE);
  ….
  End;
- Implementation of the simulation of the block decomposed model using sparse matrix for static model. 
- Krylov methods are implemented to solve the linear model J.y=b, with J the Jacobian matrix at each step of  the Newton Method. Two Krylov's solvers are considered : 
   + Generalized Minimum Residual Method (GMRES) 
   + BiConjugate Gradients Stabilized (BICGSTAB)
  To call them the SIMULATE command has to be completed with a new option : METHOD which could have three   different values : 
   + LU : (default value)  Sparse LU resolution
   + GMRES 
   + BICGSTAB
	 	Example:
 			simul(periods=100, method=lu);
                        or        simul(method=Gmres);
- Correction of various bugs in “simulate.dll”.
- Correction of simk.m
- Correction allowing a list of VALUES or PERIODS not necessarily separated by a comma. 

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