Note on the examples

Mostly the examples are modified from Lparser examples.
I think I have left the credits intact in the various files,
but maybe not. Modifications include things like replacing
some of the "[]" stack push/pop commands with "{}"s and adding
transpose commands (e.g. "t(12)") and instrument timbres
(e.g. c(71)).
All of the "bopXX.ls" and "lsysXX.ls" files certainly came to
me via Lparser.
"bop" stands for "Beauty of Plants", from the book "The Algorithmic
Beauty of Plants", and I assume that is where the basic ideas in
those files came from originally. 
