modifying tests and adding a new test against dynare++ output (fs2000k4.mod)

Estimation DLL, generalized Schur decomposition: fix bug with complex part of infinite generalized eigenvalue (was NaN instead of zero)

Estimation DLL: no longer pass lead/lag incidence matrix as argument, this is redundant with the zeta indices

C++ Estimation Minor changes to KalmanFilter initialisation and testing routines to improve handling structural changes parameters and test accuracy

C++ Estimaion: Minor change KalmanFilter.* to use gain matrix KFinv for conversion check and cosmetic changes to ModelSolution.cc, testInitKalman.cc and testkalman.cc

C++ Estimation: Adding test and fixing a bug for KalmanFilter.cc and making some cosmetic changes to InitializeKalmanFilter.cc and ModelSolution.cc

Estimation DLL: added testInitKalman to the build system, and modify it to accept the dynamic DLL as argument

Estimation DLL, DynamicDLL class: removed dependency on MEX header, unnecessary and makes the compilation of test files more complicated

Adding InitializeKalmanFilter.cc/hh, its supporting files: DetrendData.cc/hh (a basic one), libmat/DiscLyapFast.cc, a test driver routine and a minor amendment to ModelSolution.hh.

Estimation DLL, dynamic DLL loading: minor changes to testModelSolution (now takes the full name of the dynamic DLL in argument)