_NAME_
get_struct

_PROTOTYPE_
structs = get_struct(secondsSince1996, structToUse)

_SHORT-DESCRIPTION_
Get a data struct valid at a particular second-since-1996

_DESCRIPTION_
get_struct retrieves any data structure of type structName from the
archives which was valid at time secondsSince1996. Beware that
despite the singular nature of the name, an array of
structs is always returned. This array is always
terminated by a zeroed struct of type structName. The reason for this
is that, due to some anomoly with the clock perhaps, more than 1 data
struct may be stamped as valid during a particular interval, so there is
a small chance of getting more than a single "valid" data struct back.
There is a much better chance of the array only containing the
terminal zeroed struct. In such a case, either no data exists during the
interval or it has not yet been archived. 
-
get_struct is really just a special case of get_structs, where both
secondsSince1996Start and secondsSince1996Stop are set to the
same value, secondsSince1996. 

_INPUT_
* secondsSince1996 is the second-since-1996 we are looking for valid data.
* structToUse is a sample struct of the type data we are interested in
retrieving.

_OUTPUT_
* An array of structs terminated by a zeroed struct.