das6402 needs cleanup

merge das08, das16, das1600 and do cleanup

check each driver init for stuff

grep XXX

register_symtab

allocate subdevice
allocate private

fix PCI code, use pci_find_device()

make a skeleton driver

standardize error codes

writes to linux source

implement ioctl for comedi_dio_bitfield()

verify PCI-6503 code

get rid of spurious "char-major-98-0 not found"

verify 2.0.x operation

develop 8253 and Am9513 code

increase mod use count for RT