Ingestor Improvements

* Ensure OtherParser is used more often

I saw some IssueType notices with "legalother" as the key, not the
expected "legalother2" so I just loosened the regex there.

* Add Blogger and EbDmca parsers, sample files, etc

I might've liked to refactor the GoogleSecondary stuff a bit at this
point, but I restrained myself given the one-off nature of these things.

* Ensure error handler copies supporting files over too

This caused re-imports of failed CSVs to fail when trying to open the
referenced but missing files.

* Ensure files exist before opening them

I made this fix before I found the bug in the error handler. In reality,
all referenced files will always exist, but I decided to just leave the
existence checks anyway, since it makes it more robust and I see little
downside.