parsergen - don't completely hide non-critical conflicts.

parsergen - don't completely hide non-critical conflicts.

Shift/Reduce conflicts that are likely to be resolved by
a line break are currently hidden.  This is probably a good idea,
but sometimes it can be useful to see them anyway.
So report them as "non-critical" conflicts, and don't
count them - so if no other conflicts are found, the
"no conflicts" message is still generated.

Signed-off-by: NeilBrown <neil@brown.name>