Update to 0.5, convert to user-destdir.

The API of the fcall struct was changed for ANSI/C99 compliance.
A bug affecting the offset of consecutive writes was fixed. The
server's maximum message size is honored. ixpc's command line
parsing was fixed. Build problems on Solaris were fixed. The append
command was added to ixpc. wstat server support was added.

(wiz)