fix DROP OPERATOR to reset links to itself on commutator and negator

When Who What
2016-03-25 16:33:46 Tom Lane (tgl) Closed in commitfest 2016-03 with status: Committed
2016-03-25 16:33:46 Tom Lane (tgl) Changed committer to tgl
2016-03-25 14:53:02 Tom Lane (tgl) Attached mail thread A136D245-A2D6-4A19-BCC5-F8B19105B05A@gmail.com
2016-03-23 16:20:38 Robert Haas (rhaas) New status: Needs review
2016-03-23 16:20:32 Robert Haas (rhaas) Changed reviewers to Robert Haas (rhaas), Tomas Vondra (fuzzycz)
2016-03-23 16:20:32 Robert Haas (rhaas) Changed committer to rhaas
2016-03-20 14:57:30 Tomas Vondra (fuzzycz) New status: Waiting on Author
2016-03-04 21:53:39 Kevin Grittner (kgrittn) Added kgrittn as reviewer
2016-02-27 13:14:44 Roma Sokolov (roma.sokolov) Changed authors to Roma Sokolov (roma.sokolov)
2016-02-27 13:14:22 Roma Sokolov (roma.sokolov) Attached mail thread A0DF8607-A1A1-40CE-B152-82FC91EF8A3A@gmail.com
2016-02-27 13:14:22 Roma Sokolov (roma.sokolov) Created patch record