Specify security index parsing section
start SDH Index entry

used to review files:
	9-160-9
	458-160-5
Add field offsets according to Russon docs
get the iteration working
Correct format character
add -s argument for parsing SDH entries
finish up SDH class
add SDI class and support
added a lot of fields
change -s flag to -t argument, make original behavior default
fix the scope a bit