sys: use explicit Novell-style search drive mappings

Update the default net$log.dat template to map the standard search
drives with explicit DOS drive letters, matching the visible layout of
a Novell login more closely.

The default login script now maps:

  F:  -> SYS:SYSTEM
  S1: -> Z:SYS:PUBLIC
  S2: -> Y:SYS:

This makes MAP show the network search drives as Z: and Y: entries
instead of only adding SYS:PUBLIC and SYS: as unnamed search mappings.

README.md

@@ -138,9 +138,9 @@ You will probably also want to edit:
 and replace the default login script with something more useful, for example:
 
 ```txt
-MAP INS S1:=SYS:PUBLIC
-MAP INS S2:=SYS:
 MAP *1:=SYS:SYSTEM
+MAP INS S1:=Z:SYS:PUBLIC
+MAP INS S2:=Y:SYS:
 ```
 
 ## Running

sys/net$log.dat.cmake

@@ -16,17 +16,18 @@ WRITE
 ;   S1/Z:    = SERVER\SYS:\PUBLIC
 ;   S2/Y:    = SERVER\SYS:\
 ;
-; Search drive for NetWare/MARS NWE utilities:
-MAP INS S1:=SYS:PUBLIC
-
-; Search drive for the SYS: root.  This keeps SYS:\ on the search path like
-; the standard Novell login script does.
-MAP INS S2:=SYS:
-
 ; First regular drive mapped to SYS:\SYSTEM, matching the standard Novell
 ; login script layout shown by MAP after login.
 MAP *1:=SYS:SYSTEM
 
+; Search drive for NetWare/MARS NWE utilities.  Use explicit DOS drive
+; letters so MAP shows S1 as Z:, like the standard Novell login script.
+MAP INS S1:=Z:SYS:PUBLIC
+
+; Search drive for the SYS: root.  Use explicit Y: so MAP shows S2 as
+; Y: [SERVER\SYS: \].
+MAP INS S2:=Y:SYS:
+
 ; Examples for local customisation.  Enable only after creating the
 ; corresponding directories or volumes.
 ;