protect me

Following #1465 (closed) !2194 (merged) !2194 (merged)
Here is a proposition of objects to protect:

ie:to avoid a user to overwrite them by mistake
ex:

CYRIL [3]: SCAN_DISPLAY = True
CYRIL [4]:

Ouuups !

what to protect ? :

• all objects in bliss.shell.standard
• ALIASES
• SCAN_DISPLAY
• SCAN_SAVING
• SCANS

feel free to complet the list.