* implemented handling of mod file local variables (eModFileLocalVariable)
* renamed "local parameters" to model local variables (eModelLocalVariables)


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* removed Expression class; the "ExprNode" class is therefore now used everywhere
* removed interprete class, and replaced it by a method in ExprNode and an global evaluation context in ModFile
* fixed breakage of SparseDLL / Block decomposition code introduced in previous revision


git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1204 ac1d8469-bf42-47a9-8791-bf33cf982152

* reorganised code in ModelTree so that block decomposition and SparseDLL code is clearly separated
* replaced DataTree::offset by ModelTree::mode, using an enumeration of the three modes which is more explicit
* reorganised ExprNode::writeOutput method by using a sixfold enumeration type (ExprNodeOutputType) corresponding to the 6 different contexts in which an expression can be written


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* reshaped DataTree/ModelTree using a more object-oriented approach
* improved expression sharing algorithm (temporary terms in output files), resulting in smaller output files for big models
* optimized performance (both in computing time and memory consumption)
* bugfix: the expressions stored in local parameters of models (pound expressions) are now derived
* bugfix: cosh(0) = 1
* removed some useless parentheses in output


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* cleaned and simplified the code
* incorporated VariableTable as a private member of DataTree/ModelTree


git-svn-id: https://www.dynare.org/svn/dynare/dynare_v4@1118 ac1d8469-bf42-47a9-8791-bf33cf982152

v4 parser: created ModFile class, which is the abstract representation of a mod file; removed all static variables


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v4 parser ModelTree/DataTree, ModelTypes.h: incorporated some code as object methods, cleaned up some documentation


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