basicdoc: major doc update

assets/disk0/tbas/doc/sample_99.tex

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+This is a sample program that prints out the infamous \emph{99 Bottles of Beer}.
+
+\begin{lstlisting}
+10 FOR I = 99 TO 1 STEP -1
+20 MODE = 1
+30 GOSUB 12
+40 PRINT I;" bottle";BOTTLES;" of beer on the wall, ";i;" bottle";BOTTLES;" of beer."
+50 MODE = 2
+60 GOSUB 12
+70 PRINT "Take one down and pass it around, ";(I-1);" bottle";BOTTLES;" of beer on the wall."
+80 NEXT
+90 PRINT "No more bottles of beer on the wall, no more bottles of beer."
+100 PRINT "Go to the store and buy some more. 99 bottles of beer on the wall."
+110 END
+120 IF I == MODE THEN BOTTLES = "" ELSE BOTTLES = "s"
+130 RETURN
+\end{lstlisting}