Broken PURLs in CHIRO

[matentzn]

Hey! In our great OBO wide effort to fix our PURLs, I noticed the following wrong ones being used in CHIRO:

• http://purl.obolibrary.org/NCBITaxon_2 (should be: http://purl.obolibrary.org/obo/NCBITaxon_2)
• http://purl.obolibrary.org/GO_0016088
• http://purl.obolibrary.org/GO_0003824
• http://purl.obolibrary.org/GO_0003809

[nicolevasilevsky]

http://purl.obolibrary.org/NCBITaxon_2 looks like it is a duplicate, so I obsoleted it.