Before, results from `dca` would look something like
## + py/meta/alerts/remote-flow-sources-reach
- django/django@c2250cf_cb8f: tests/messages_tests/urls.py:38:16:38:48
reachable with taint-tracking from RemoteFlowSource
- django/django@c2250cf_cb8f: tests/messages_tests/urls.py:38:9:38:12
reachable with taint-tracking from RemoteFlowSource
now it should make it easier to spot _what_ it is that actually changed,
since we pretty-print the node.
This makes it easier to add a new test-case, and makes it easier to work with
the existing files. It does have a downside on making it a bit more annoying
looking at TestTaint.expected, and possible longer runtime, but I think it's
still worth it.
I took the bits from ql/test/library-tests/taint/ that seemed easy to port. I
left out namedtuple for now, but it is part of internal tracking ticket, so
won't be forgotten.
