Makefile: Added AIX 3.2.5.

Makefile: Added AIX 3.2.5.
loadparm.c: Added "win95 bug compatibility" parameter.
local.h: Replaced MAX_OPEN_FILES back to 100 from 10 (oops).
reply.c: Fixed ulogoff check against uid - changed to vuid.
server.c: Changed file struct save of uid - changed to vuid.
smb.h: Changed id in struct current_user to vuid.
       Changed file struct uid to vuid.
time.c: Added "win95 bug compatibility" atime -> mtime return.
trans2.c: Added "win95 bug compatibility" fixes.
uid.c: Changed id in struct current_user to vuid - added checks
       to set/reset it.
util.c: Added code to expand environment variables.
version.h : still at 1.9.18 (head branch doesn't matter too much at present).
Jeremy.