Document optional precision argument to cents/ratio methods.
Include filename inside *.scl file via write method if possible, per
convention of existing scala files.
Example scripts.
Mention example files.
Do not dup eg/ scripts in POD (but mention where they live).
Add get_cents, notes2cents to mirror the ratio routines available.
Another example script.
Account for *.scl that begin with implicit 1/1 ratio.
Filter out scales that do not always move up.
More ideas for scala file investigation.