[Obo-diffs] changes for: cell

[<cj...@fr...>]

* Created link CL:0000082 -OBO_REL:is_a-> CL:0000066
* Created link CL:0000083 -OBO_REL:is_a-> CL:0000066
* Added synonym "syncitium" to CL:0000228
* Changed synonym scope of CL:0000228 from "Related" to "Exact"
* Created link CL:0000307 -OBO_REL:is_a-> CL:0000066
* Created link CL:0000387 -OBO_REL:is_a-> CL:0000519
* Added synonym "T-helper lymphocyte" to CL:0000492
* Changed synonym scope of CL:0000492 from "Related" to "Exact"