possibility to input a threshold in the ShiftScheduler. If the time to end shift is below this threshold then machine does not accept new jobs

test with failure depended on working time and shift. Seems towork correctly, but calculation of proportions is problematic. To check

projects that consume space because their assembly started in a previous period and is not finished yet are now taken into accout. Test added

if stations share resources there is no need that input defines the interval capacity in all of them