in between ng-spice-0.2 and ng-spice-0.3 that eliminated the
following warnings: 'suggest parentheses around && within
||'. The parenthesis were not placed correctly, leading to
incorrect behaviour of the pole-zero analysis.
* tests/polezero/*.out: Changed the content of these files because
the bug that caused the incorrect pole-zero results have been
traced to src/spicelib/analysis/cktpzstr.c.