The attached patch defines the new target ```make print-gh-tuple``` that prints ```GH_TUPLE``` for all git submodules of the default Git repository ```${GH_ACCOUNT}/${GH_PROJECT}``` when ```USE_GITHUB=yes``` is set.
Purpose: Simplify creation of the ```GH_TARGET``` tag when the repository has a lot of submodules.
It traverses and returns all submodules hierarchically.