which executes pylicense with all configs matching
"PROJECT_ROOT/.pylicense*.cfg"

This reverts commit 2621d88d.
because cmake doesn't actually accept this despite what
the docs say

Previsouly whenever the target list changed, _ALL_ tests were
recompiled/rerun. Now only actually new targets will be run/compiled
while removed ones will simply be discarded.

This partially reverts commit 6356a2c1.
The script is still added, but the install requires for numa is removed
and the import delayed.

This cloes #29

using > 1 process results in hard to debug issues

This reverts commit ff1b19df.

refactor la backends discovery/usage