gcc6 compilation error

[bartoszek]

When building against gcc 6.2.1 (@archlinux) got this error

/tmp/yaourt-tmp-bartus/aur-cmvs-pmvs-git/src/CMVS-PMVS/program/base/cmvs/../stann/dpoint.hpp:492:10: error: no match for ‘operator<<’ (operand types are ‘std::basic_ostream<char>’ and ‘std::istream {aka std::basic_istream<char>}’)
       std::cerr << "Error Reading Point:"
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          << is << std::endl;
          ^~~~~

It looks like moving the operator inside the namespace may fix the issue (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26037#c6)