Removing ressource fork AppleDouble fails, bug #542

When the AFP client uses FPSetForkParms to set the ressource fork
length to 0, Netatalk will call unlink() in ad_rtruncate() in
libatalk/adouble/ad_write.c in order to to unlink the files
AppleDouble ressource fork.

The function ad_rtruncate() gets just the filename as path from the
caller, so obviously at this point the caller should have ensured that
it had called chdir() to the enclosing directory of the file.

Fixes bug #542.
macusers showed root user. Bug #495.
update manpage of afp.conf

add dbus daemon.
sort.
Add file pathname to logmessage parse_entries: bogus eid. FR#87
veto files: syntax clarification
dbd: remove orphaned ._ AppleDouble files. Bug #549.
Automatic conversion for OS X ._ AppleDouble files, bug #550

Add automatic on-access conversion for ._ AppleDouble files created by
OS X to Netatalk's AppleDouble format.

OS X .AppleDouble files most of the times contain a FinderInfo
AppleDouble entry with a size larger then 32 bytes, containing packed
xattrs. Netatalk fails to cleanly deal with these and logs them as
"bogus entry id 9".