Investigate changing name exists_during to 'during'

[rachhuntley]

Changing the name of exists_during to during was proposed at an annotation call (see example 1 http://wiki.geneontology.org/index.php/Annotation_Conf._Call,_July_28,_2015).

Some examples of current usage;
O75581 GO:0031410 cytoplasmic vesicle exists_during(GO:0016055 Wnt signaling pathway) PMID:20093472

O43464 GO:0005829 cytosol exists_during(GO:0009411 response to UV) PMID :11583623

O94487 GO:0035974 meiotic spindle pole body exists_during(GO:0007135 meiosis II) PMID:18397994

P10901 GO:0005576 extracellular region exists_during(GO:0030583 myxococcal fruiting body development) PMID:1310316

P39429 colocalizes_with GO:1990597 AIP1-IRE1 complex IPI 'with' Q9EQY0 exists_during(GO:0034976 response to endoplasmic reticulum stress) PMID:18281285

P46549 GO:0005938 cell cortex exists_during(WBls:0000003 embryo Ce) PMID:23064028

[ValWood]

Isn't there an existing parent relation 'during' ? so a merge?