DynareOBC v2.71.1615

This is a minor bug fix release.

It fixes two bugs related to the quick check for whether M is a P matrix. Firstly, the code was not double checking determinants on the correct sub matrices, potentially generating spurious success or failure of the quick P matrix check. Secondly, due to the previous bug, the code was occasionally attempting to double check the determinant of an empty matrix, which was an unhandled case, resulting in an error. To fix the latter bug, the general handling of empty matrices within the DoubleDouble class has been improved.

Additionally, this release updates assorted dependencies.