Maintenance script update.
Maintenance script update.

 Check header status when downloading ontology source file.
OntoZoo/ontobee,e4ong1031/ontobee,e4ong1031/ontobee,e4ong1031/ontobee,ontoden/ontobee,OntoZoo/ontobee,OntoZoo/ontobee,ontoden/ontobee,ontoden/ontobee,e4ong1031/ontobee,OntoZoo/ontobee