"tabf", new keyword

[N. J. A. Sloane]

thanks to Antti Karttunen's program, the database now can
display sequences coming from arrays as 2-dimensional arrays
(I mentioned this in a recent posting).

to distinguish sequences coming from "funny-shaped" arrays
- for which Antti's program doesn't work, and produces
a horrible mess - i have introduced a new keyword "tabf"

this applies for instance to sequences coming from arrays 
of shape

*
***
*****
*******
*********

or

* 
*
**
**
***
***
****
****
...

- any time it doesn't make sense to break up
the sequence into chunks of lengths 1,2,3,4,5,6,7,...

Neil