gkeys/log.py: Update debug prints to function type
gkeys/lib.py: Make set_keyseedfile() load any seeds
gkeys/actions.py: installkey() Remove unused SeedHandler instance
gkeys/actions.py: Add seedfile option to installkey action
gkeys: Fix action.py listkey() to work with gkey.seeds

Add fingerprint, long keyid output to options.
Add nick parameter to GkeysGPG.list_keys() to limit output to the one nick.