* do not persist legacy analyzers into _analyzers table
* fix arangosearch upgrade in cluster
* get rid of Vasiliy's shit
* address review comments
* ensure link is synchronized after creation in upgrade
* fix compilation error
* minor cleanup
* fix tests
* distribute '_analyzers' collection as '_graphs'
* comment out Vasiliy's shit part 2
* issue 526.6: implement REST and V8 handlers for the iresearch analyzer feature
* address typo
* remove excess comments
* temporarily comment out tests failing on MacOS
* temporarily comment out more MacOS-only test failures