neither start-new nor remove should be exposed to user at the moment

as they do not work; their existence will only cause confusion

mpsd-software.py

@@ -1049,8 +1049,8 @@ def main():
         ("prepare", "Prepare the environment for installation on the disk"),
         ("install", "Install a software environment"),
         ("reinstall", "Reinstall a software environment"),
-        ("remove", "Remove a software environment or toolchains from an environment"),
-        ("start-new", "Start a new software environment version"),
+        # ("remove", "Remove a software environment or toolchains from an environment"),
+        # ("start-new", "Start a new software environment version"),
         ("status", "Show the status of the software environment"),
     ]
     for cmd, help_text in list_of_cmds: