Complain less when trying to open nonexistent files

Signed-off-by: caotto <ottochar@gmail.com>
-std::numeric_limits<float>::max() convention for matching templates where one or both failed to enroll
Merge branch 'master' of https://github.com/biometrics/openbr
removed likely internal files
moved likely code to its own repository
Merge branch 'master' into qt5
udpated to latest master