Fixed normalization of negative join filters

Previously, negative join filters were folded in with positive joins by
AND/ORing them together and negating the negative joins. Checking for
the existence of something that doesn't match a condition is different
from checking for the non-existence of something that does match a
condition, so now normalization considers positive and negative join
filters to be distinct classes of filters and does not fold them
together.

Also made some whitespace changes.

0 files changed, 0 insertions, 0 deletions