ipc.c: Fix for printer queue spinning with Win95.

ipc.c: Fix for printer queue spinning with Win95.
nmbd.c: Fix for always overwriting log despite append setting.
smb.h: Addition of last time password changed entry to account info.
smbpass.c: Changes to support last time changed field in smbpasswd file.
smbpasswd.c: Changes to support last time changed field in smbpasswd file.
util.c: Fix for always overwriting log despite append setting.
Jeremy.
(This used to be commit eb4fe9ecdf539209efab07dc992447ea7370cf93)