Revert "opgeruimd"

This reverts commit 47324d8576f0e5ef15de695cc8fdb6cb9276f18b, reversing
changes made to e49d336e3013ae19bc24c090683fc3ef2be6d704.
restore master.
Merge branch 'master' into ultrasoon

Conflicts:
	modules/ultrasoon/ultrasoon.c
	test/test_ultrasoon.cpp