Error conditions

<name>	code	description
NULL	1	"Null Pointer"
NNUL	2	"Non-Null Pointer"
NEGA	4	"Bad Negative Value"

The status codes in the table above are stored in the constants COMPUTESKYH_E<name>, and the status descriptions in COMPUTESKYH_MSGE<name>. The source code with these messages is in ComputeSky.h on line l.114.