Extend comps-sync more, add font packages
    
    `comps-sync.py` now has support for explicitly syncing *from* the
    workstation comps.  In order to do this sanely though, we need a
    "blacklist" of things we don't want to sync.
    
    There are a few issues here:
    
     - desktop applications
     - dubious CLI apps
     - dnf
     - dubious misc things: e.g. `tcp_wrappers`, `crontabs`
     - arch-specific bits (not handled right now)