PyEmbedded tests: Consequentially use import_bornagain.
Also: add message to CI Win.
Some commits were intended to cache the Win build directory, but this did not succeed and is reverted in the last commit.
Edited by Wuttke, Joachim
Also: add message to CI Win.
Some commits were intended to cache the Win build directory, but this did not succeed and is reverted in the last commit.