put_bookmark

    mark position
         ea      - address to mark
         lnnum   - number of generated line for the 'ea'
         x       - x coordinate of cursor
         y       - y coordinate of cursor
         slot    - slot number: 0..1023
                   if the specified value is not within the range,
                   IDA will ask the user to select slot.
         comment - description of the mark.
                   Should be not empty.
    returns: none

    void put_bookmark(long ea, long lnnum, long x, long y, long slot, string comment);