Algorithms are sequences of instructions to DAN (i.e. statements) that
conform to a syntax that DAN can recognize.  These statements are
checked for errors and then executed to produce plots, and/or files
containing processed data, and/or listings.

Construction of algorithms is up to you.  Normally, DAN's editor
is used to create an algorithm and save it in a text file, but you
may wish to use your own favorite text editor.

DAN's default subtype for algorithm files is `.ALG'; however, any
subtype can be used.
