* in DataTree, new functions for testing if some opcode (unary, binary or trinary) is used somewhere in the tree
* removed DataTree::containsSteadyState(), rather use a call to the new utility function

2) fixed derivatives using kronecker products a la Iskrev

2) warning off divde by zero
3) better figure layout

* fixed initialization of matrices
* removed useless ModelSolutionException, rather forward upwards the exception thrown below
* DynamicModelDLL is now a full member instead of a pointer

* finished test for DecisionRules
* added new test for LUSolver
* improved test for QRDecomposition

* fixed various bugs
* added utility for computing the infinite norm
* changed the direction of mat::transpose(A, B) for consistency with GSL

Bugs corrected: exogenous variable are read from and external file if oo_.exo_simul is not completely filled => allows for shocks.

dynare_config adds matlab/missing/bsxfun in the path if needed. bsxfun.m is a replacement for matlab's
built-in bsxfun function (missing in versions older than 7.4).

Estimation DLL: test file for DecisionRules based on example1.mod (only checks the eigenvalues for the moment)

Amend Estimation C++ ModelSolution, some utils (new Matrix version of dynamic_dll) and a test routine

Estimation DLL, matrix library: fixed problem in QRDecomposition (two workspaces are needed of different sizes) by imposing in the constructor the size of the matrix to be left-multiplied by Q

when computing the Brooks and Gelman convergence diagnostics.

preprocessor: under Octave/Windows, with USE_DLL, do not require "cygwin" or "msvc" option (closes #76)