Unhide barlines when doing automatic modernizations

[craigsapp]

When there is no modernization filters in a score, add a shed filter to unhide invisible barlines.

Example:

Here is the original (diplomatic) version of the score:

https://polishscores.org/?id=pl-gd--ee-1638--008-001

Here is the current automatically modernized score:

Notice that there are ties added across invisible barlines, but the barlines should also be shown automatically.

[craigsapp]

Implemented with commit https://github.com/craigsapp/website-polish-scores/commit/acb0932b325ec2ac55ea490b921e242d1457d4ac

Example:

Note that the system decoration for this score:

!!!system-decoration: [(s1,s2,s3,s4,s5,s6)]

Should instead be:

!!!system-decoration: [s1,s2,s3,s4,s5,s6]

Or shorthand:

!!!system-decoration: [*]

This will not draw measure lines between staves in the score, which is more standard for vocal music with text (because the barlines interfere with the readability of the lyrics):