Revert "When PID is enabled, don't use the I value from previous one, that seems to enhance overshoots (added that in April, not sure anymore why)"

This reverts commit 9535cf1a.

When PID is enabled, don't use the I value from previous one, that seems to enhance overshoots (added that in April, not sure anymore why)

Removed resetting pid_sum when PID is turned on (at beginning they are initialized as 0 already, and when we update the PID parameters or turn it off and on again, this does not reset the last values).

Fixed workload issue with two addition time variables, set DIO output at t=0, use for loop for AOut channels (PIDs) --> Loop might be removed again!

-modified adbasic code to record the 16 AIN channels at the times that are specified by labscript

test