This spell implements something similar to an entry I made for the A.O.P.C.
a few years ago, which rotated the word 'perl' around on screen. This one
scrolls, in a sort of C64-demo-ish fashion, the phrase 'The Perl Journal'
around on screen.

How does it do that? Well, quite simple. It uses an index into the
above-mentioned phrase, which is the starting point at which to write the
next 10 letters on screen. After this has been done, the index is advanced
one, until there are no more letters to print. From there, it works
backwards printing the characters until the first character of the phrase
is reached...and it starts all over again.

The characters in the string are 'encoded' as numbers representing 8x8
blocks of bits, where 0 means invisible, and 1 means (surprise) visible.

The code contains some little hacks to preserve space.

For the program to work, you need to run it on a VT100-compatible terminal
(xterm and most consoles will do just fine), with a width of atleast 80 and
a height of atleast 9 characters.
