Consider using a different regression test suite

[D4N]

The current regression test script has some problems for managing it with git:

1. The regressions are added into a single file
2. The test results are added into a single binary file

Both make cherry-picking new commits onto old ones to backport changes quite cumbersome, especially the binary file, as git can't diff binary files. It would be a lot better if we would split the test file into lots of single files where each of them tests one single issue. This would make backporting very easy.

[clanmills]

Gosh, this could be tough. We should ensure that all "reference" files (such as bugfixes-test.out) is ascii. The main "culprit" here is bugfixes-test.sh which is monolithic monster. It would be better to have little scripts for every fix: bugfix-1234.sh with their own reference file bugfix-1234.out

So bugfixes-test.sh would drive individual scripts. Easy stuff. You can imagine why I've never given this priority.

[D4N]

I'll see if there is an easy way how to split the monolithic monster.

We could also try to use the unit test suite for regression tests.

[D4N]

Fixed by #155.