Broken links to PDFs

[jamesscottbrown]

There are a bunch of broken links to PDFs that begin with http://old_co.mbine.org/sites/default/files/ rather than http://old_co.mbine.org/system/files/ .

For example, the COMBINE 2019 agenda page links to http://old_co.mbine.org/sites/default/files/COMBINE_2019_Book.pdf rather than http://old_co.mbine.org/system/files/COMBINE_2019_Book.pdf

Here's a GitHub search for sites/default/files

[pgleeson]

Thanks @jamesscottbrown. I've updated a number of these broken links. Please let me know if you find any others.