Rename tsvector delete() to ts_delete(), and filter() to ts_filter().

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 0b9a23443283f9ffb17a39c25f74adefdb72cae1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-05-05T23:43:32Z
Releases: 9.6.0
Rename tsvector delete() to ts_delete(), and filter() to ts_filter().

The similarity of the original names to SQL keywords seems like a bad
idea.  Rename them before we're stuck with 'em forever.

In passing, minor code and docs cleanup.

Discussion: <4875.1462210058@sss.pgh.pa.us>

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