[pkg] Declare extras (optional) dependencies
This is primary to extract "pyramid" dependencies out of install_requires as they are actually optional. Along the way, resurrect all things in __pkginfo__.__recommends__ which were not used at all and convert them into extra_requires. It appears that __depends__ and __recommends__ in __pkginfo__.py are not useful so drop them and inline dependencies as install_requires/extra_requires in setup function call. For pyramid tests to continue working, add respective dependencies to test-misc.txt requirements file.