Fix interactive run-unittest.d ...

When providing arguments to run-unittest.d it would use them to determine which files to run. This change makes it, so that it doesn't try to run the arguments both as .d and as .sh files.

Run d scripts ...

run-unittest.d runs files in `test` subdir with "*.script.d" extension

Fix the path to the binary

Add common package

Accidentally disabled all posix OSes except linux

Attempt to replace run-unittest.sh by run-unittest.d. Inception