Better support for psql

# Problem

psql is the command line PostgreSQL client that is part of PostgreSQL itself, so it's very popular.

However, when using it with `EXPLAIN ANALYZE`, it adds a lot of undesirable characters to the text output, especially the `+` symbols at the end of every line, see below:

```
$ psql
psql (11.6)
Type "help" for help.

postgres=# EXPLAIN (ANALYZE, FORMAT JSON, VERBOSE, BUFFERS) SELECT 1;
QUERY PLAN
-------------------------------------
[ +
{ +
"Plan": { +
"Node Type": "Result", +
"Parallel Aware": false, +
"Startup Cost": 0.00, +
"Total Cost": 0.01, +
"Plan Rows": 1, +
"Plan Width": 4, +
"Actual Startup Time": 0.004,+
"Actual Total Time": 0.005, +
"Actual Rows": 1, +
"Actual Loops": 1, +
"Output": ["1"], +
"Shared Hit Blocks": 0, +
"Shared Read Blocks": 0, +
"Shared Dirtied Blocks": 0, +
"Shared Written Blocks": 0, +
"Local Hit Blocks": 0, +
"Local Read Blocks": 0, +
"Local Dirtied Blocks": 0, +
"Local Written Blocks": 0, +
"Temp Read Blocks": 0, +
"Temp Written Blocks": 0 +
}, +
"Planning Time": 0.168, +
"Triggers": [ +
], +
"Execution Time": 0.082 +
} +
]
(1 row)
```

# Proposal

Allow users to paste the bad psql output and automatically remove the trailing `+` characters for them. Perhaps also ignore the header and footer:

```
QUERY PLAN
-------------------------------------
```
```
(1 row)
```

Alternatively, or perhaps in addition, figure out if it's possible to tell psql to not use this stupid output format and create a documentation page for psql users that tells them what options to use.