====== Deleting a model family ======
A real world example:  Say a user deleted the model family 
directory from inside the model base directory.  The model
base gets messed up and the mfTbl must be patched to let
it know the family is deleted.  Here are the steps:

1. login as samm through putty

2. Start the patch tool:
<code> MBpatcher </code>
3. Set up the model base variable
<code> set MBroot /whatif/samm/Models_MB </code>
4. Go into that model base
<code> moveto MBroot </code>
5. Look at the model families table
<code> show mfTbl </code>
6. scroll up to find out what the record number for the macro model family you
deleted and keep track of that number
7. Start patching the model family table
<code> patch mfTbl </code>
8. Tell it the record number you found in 6 and it will print the info about
that record
9. Tell it we want to delete this record
<code> creFlag = "F_DELETED" </code>
10. Complete the patch:
<code> done </code>
12. Close MBPatcher
<code>  quit  </code>