Restore qFatal in ASSERT

Joachim Wuttkerequested to merge
EarlyFatal into main

If BORNAGAIN_GUI and not BUILD_DEBUG, then upon failed assertion call qFatal. Otherwise, throw runtime_error as before.

This restores the behavior from before commit f0f8b3c2 of 29oct20.

This resolves #186 (closed).

Edited by Joachim Wuttke

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