MBSE BBS package installation issues

Issues found with the current MBSE BBS debian package installation:

• The mbuseradd program should have permissions of 6711.
• There is stil an issue with how the bbs user is being installed, as it one cannot log in to it in order to run the newuser program.

 This works for mbsetup, both for starting and for use

• -rws--s--x 1 root root 134644 Feb 13 10:19 mbtask