Fix handling of end point intersection case
Fix degenerate handling
Fix overflow cases
Simplify logic in SEG::Collide
Remove overly simplistic check for intersection
Add multiple QA regression tests
This means that you can run just a single case from the command line,
for example:
`qa_pcbnew -t DRCCopperSliver/_0`
The case is also automatically printed as context.
This means that when isolating a specific defect in one case,
you can run only that one case, which is useful under debuggers
and also when using slow tools like valgrind.
Not all possibe tests are doing this, but they're easy to do
when needed (i.e. when you want to run just one case)
Recommendation is to avoid using the year nomenclature as this
information is already encoded in the git repo. Avoids needing to
repeatly update.
Also updates AUTHORS.txt from current repo with contributor names
We are calculating the same value in two different ways. If there is an
off-by-one issue in our calculation along axis, this still means that it
was a direct hit on the line as seen in the unit test cases
