Merge pull request #538 from JohannesPfeifer/master

Clarify terminology in Manual
proprocessor: block code bug fix: M and oo not being passed to solve_two_boundaries
preprocessor: bug fix: return oo
fix bug introduced by ee812f38816294450a307ccb8f2fb2a27fc032f0
preprocessor: match dates in dynare syntax
fix comment
preprocessor: deal with dates in NativeStatement
preprocessor: remove "using namespace std" where not needed
preprocessor: remove unused private field in EstimationStatement
preprocessor: remove unused private field in ConditionalForecastPathsStatement
preprocessor: eliminate clang warning about using namespace std
preprocessor: ExprNodeLess is a struct
preprocessor: allow empty estimated_params_init block