bug in virtual filesystem which could cause the filesystem to
disappear if you looked in the Shares virtual file

tweeks to Auth code (mainly tidying) and trying to get auth to work to
vista.  turns out you need to apply a hotfix (regedit)
http://support.microsoft.com/kb/957441 and cifs is happy with vista.

major overhall of DFS code.  works much better but still does not
cross servers and doesn't give any helpful messages when it fails :-(

case significance is now enforced by cifs, though you still cannot create
Makefile and makefile as seperate entities.  This is enabled by
default but can be disabled by a command line option.

also fixed a bug in UNICODE handling, I got away with this on windows
but cinap's cifsd drew blood.

execute requests are always denied on cifs files.  Perhaps this too
should be a command line option, but having plan9 executables on a
windows server is a rarity IMHO.

in CIFStreeconnect() removed ths strupr() call - trees are not neccessarly
upper case, some servers are case significant on volume/share names.

-Steve