removed the parameters to select the side of the deque inserts and removes again
new delay implementation
lcrq queue added
LCRQ queue added
different interpretation of the delay parameter for the TS Deque
lcrq queue added
changes in the get_left and get_right method: the iteration stops at the left-most or right-most element that was read at the beginning of the iteration, not at the end of the doubly-linked list
TS hardcoded queue and TS hardcoded stack updated
changed the interface of the LCRQ queue so that it deals correctly with empty dequeues