M-files and preprocessor:

* removed "options_.simul", and instead test if "options_.periods" is non-zero
* test for the incompatibility of options "periods" and "hp_filter" in "stoch_simul.m", instead of in the preprocessor
Reference manual:
* removed "simul" options, updated "periods"
* updated "order" option (for 3rd order)
* added "k_order_solver" option
* give some hints for installing a compiler for users of MATLAB for Windows


git-svn-id: https://www.dynare.org/svn/dynare/trunk@3188 ac1d8469-bf42-47a9-8791-bf33cf982152