Add ability to add/update predicates for [uid] type

Issues Ratel
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1

Moved from GitHub ratel/108

Posted by danielmai:

In the Schema tab, the uid type has checkboxes for count and reverse, but not for list. In Dgraph v1.1 it’s possible to create either uid or [uid] predicates.

2

paulftw commented :

c44c27f88ad036b3ba4c9ffbea5db286473d9929