This should remedy the reported behavior of statuses quietly being changed to "Not Reviewed".
scan.inc - Added new set_Host_Error method to set the error value for a specific host
parse_excel_echecklist.php - explicitly check for the status to equal 1-of-7 expected values, if not, add note to finding, set scan error message, and default status to "Not Reviewed"
export.php - Added cell lock for A11:E{last row} with the default password of "sagacity" (all lowercase)
Fixes#80
