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 specifed 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);