Resolve "otb::TestHelper::RegressionTestOgrFile() always says Yes"

The main point here is to fix the --compare-ogr option in OTB tests.

As a small improvement to reduce the number of multi-baselines, the tolerance used with this option is now also used to check the extent.

Then a lot of tests have been fixed. In some case, the use of a large input was not necessary. The LineSegmentDetector test has been updated with a smaller data.

Closes #1818 (closed)