Readme download section seems to be out-of-date or incorrect

[malcolmsailor]

The readme says:

For downloading a local copy of remote files, see Code.updates_and_checks.remote_scores and the argument convert_and_write_local.

However, there is no function called remote_scores in Code/updates_and_checks.py. There is such a function in Code/collect_convert.py but it appears to be a different function and doesn't have a convert_and_write_local argument. There is a convert_and_write_local function in this second file as well, but there doesn't seem to be an argument by this name anywhere in the code base.

[MarkGotham]

Thanks for catching that. What do you think best for handling this? Perhaps a shared download_from_URL function for 3 different use cases:

1. test suite: no further action (if the URL works then that's information enough)
2. write a local copy in original format (.krn, .mscx etc.)
3. convert to mxl and write a copy