headpin-sys-groups - update UI to allow system groups in headpin mode

headpin-sys-groups - fixed edit system w/ Library, headpin menus
headpin-sys-groups - link systems in group to systems page
headpin-sys-groups - link from system to groups
headpin-sys-groups - headpin spec tests
headpin-sys-groups - exposed menus
headpin-sys-groups - fixed spec tests
Merge pull request #2291 from thomasmckay/headpin-sys-groups

headpin-sys-groups - update UI to allow system groups in headpin mode