Minor bug fixes
--XPEHH output header is now separated by tabs instead of spaces.
--Removed references to missing data (which is not accepted), and introduced error checking in the event of non-0/1 data being provided.
--XPEHH output header is now separated by tabs instead of spaces.
--Removed references to missing data (which is not accepted), and introduced error checking in the event of non-0/1 data being provided.