Merge pull request #3768 from RosettaCommons/vmullig/fix_xcode_build_after_jd3
Trying to fix xcode build after JD3 refactor.
Xcode flags cases in which `auto` is misused, causing objects to be copied inadvertently. For example:
`for ( auto const larvaljob: larvaljobs_ ) { ... }`
This should be `auto const & larvaljob`.