* trustdb.h, trustdb.c (uid_trust_string_fixed): New.  Return a fixed-size
translatable string similar to trust_value_to_string. This allows for
easier lining up of displays.
* keyedit.c (show_key_with_all_names), keylist.c (list_keyblock_print):
Use it here to print validity strings.
* gpgv.c: Stub.