photo. Use the short keyid as the filename on 8.3 systems.
* exec.h, exec.c (make_tempdir, exec_write, exec_finish): Allow caller to
specify filename. This should make things easier on windows and macs
where the file extension is required, but a whole filename is even better.
* keyedit.c (show_key_with_all_names, show_prefs): Show proper prefs for a
v4 key uid with no selfsig at all.
* misc.c (check_permissions): Don't check permissions on non-normal files
(pipes, character devices, etc.)
* misc.c (pct_expando): %t means extension, not name ("jpg", not "jpeg").
* keyserver.c (keyserver_spawn), photoid.c (show_photos), exec.h, exec.c:
Allow the caller to determine the temp file extension when starting an
exec_write and change all callers.
