Specifying parent load path

[Panicz Maciej Godek]

I recently decided to clean up the GRASP repository a bit. Previously, all
the modules were piled in a single 'src/' directory, but I'm splitting it
into a few different directories.

Among those files, there were some tests included. They were essentially
stand-alone programs, but I thought it would be nice to move them all into
'src/tests/' directory.

The only problem is that once I do that, they no longer see their
dependency modules.

I tried adding
-Dkawa.include.path="|:`pwd`/src"
and
-Dkawa.include.path="|:.."
to the test runner, but none of it helped.

Here's the implementation of the test runner:
https://github.com/panicz/grasp/blob/main/run-tests

Is it possible to hint Kawa to look for modules in the file's parent
directory?