ontology pull mechanism creates new submissions when content of ontology doesn't change

[alexskr]

ncbo_cron ontology pull mechanism creates new entries for ontologies every day while the content of ontology doesn't change.
For example, some OBO files have "data-version" or "date" metadata entries automatically generated everyday while the actual content of ontology doesn't change for years. Pull mechanism should probably be adjusted to accommodate this behavior.
Take a look at MA and SBO ontologies:
[root@bmir-admin1 repository]# diff MA/39/ma.obo MA/125/ma.obo
2c2
< data-version: releases/2016-07-16

data-version: releases/2016-12-22
[root@bmir-admin1 repository]# diff SBO/585/SBO_OBO.obo SBO/565/SBO_OBO.obo
2c2
< date: 24:01:2017 07:00

---

date: 01:11:2016 07:00