adding mex-files for 2x2 matrix operations to connectivity/private, and updating sfactorization_wilson2x2 to ensure double input (such that the mex files will work)


git-svn-id: svn+ssh://svn.fcdonders.nl/home/svnroot/fieldtrip/trunk@9175 0cf7c7f0-3615-4144-b4e6-68da3bce3cd0