dosutils: add RIGHTS and finish Novell-style display fixes

- add RIGHTS as a new multi-call DOS utility
- implement Client32 NCP87 effective-rights query helper
- map NCP effective-rights bits to Novell RIGHTS display order
- keep legacy directory-handle based rights lookup as fallback
- match Novell RIGHTS output for directories and files more closely
- remove hardcoded MARS/SYS and SYS display fallbacks from RIGHTS/FLAGDIR
- derive display prefixes from the active network drive where available
- adjust FLAGDIR output formatting to match Novell field alignment
- keep FLAG and SLIST unchanged after checking for hardcoded prefixes

README.md

@@ -40,6 +40,7 @@ Still to validate or continue:
 - Server listing through `SLIST`
 - File attribute management through `FLAG`
 - Directory attribute management through `FLAGDIR`
+- Effective rights display through `RIGHTS`
 - Optional mars_nwe debug control hooks
 - Developer diagnostics through `TESTS`
 
@@ -63,6 +64,7 @@ The current command dispatcher includes these built-ins:
 - `SLIST`
 - `FLAG`
 - `FLAGDIR`
+- `RIGHTS`
 - `DEBUG`
 - `ECHO`
 - `CD`
@@ -114,6 +116,7 @@ This path is currently used by:
 
 - `FLAG`
 - `FLAGDIR`
+- `RIGHTS`
 
 The old `Net_Call` / INT 21h requester path is kept as a fallback where appropriate, but Client32 is now preferred for the validated FLAG-family operations.
 
@@ -363,6 +366,30 @@ MARS/SYS:UDIR
 
 `Private` is intentionally rejected for the current NetWare 386-style path.
 
+
+### `RIGHTS`
+
+Display effective NetWare rights for a file or directory.
+
+Typical usage:
+
+```text
+RIGHTS [path]
+```
+
+Supported in this first version:
+
+- directory paths
+- file paths, using the parent directory rights for the first read-only implementation
+- Novell-like display of the effective rights mask
+
+Rights are shown in the traditional order:
+
+```text
+S R W C E M F A
+Supervisor, Read, Write, Create, Erase, Modify, File scan, Access Control
+```
+
 ### `DEBUG`
 
 Set mars_nwe debug levels for selected server-side modules.