Re: Psql meta-command conninfo+

Hi,

I have attached 3 new patches v37-000* which display the
\conninfo+ output as 2 columns "Parameter" and "Value".

The other 2 patches are:
1. A new libpq function, PQparameterNames, which returns
names of parameters reported by the server.
2. Mark role as GUC_REPORT.

All these patches include necessary documentation changes.
Also, code is formatted with pgindent.

Output:
postgres=# \conninfo+
Connection Information
Parameter | Value
-------------------------------+------------------------
Database | postgres
Client User | hunaid
Host | localhost
Host Address | 127.0.0.1
Port | 5430
Options |
Protocol Version | 3
Password Used | false
GSSAPI Authenticated | false
Backend PID | 52044
SSL Connection | true
SSL Library | OpenSSL
SSL Protocol | TLSv1.3
SSL Key Bits | 256
SSL Cipher | TLS_AES_256_GCM_SHA384
SSL Compression | off
ALPN | postgresql
role | none
server_encoding | UTF8
server_version | 18devel
client_encoding | UTF8
session_authorization | hunaid
standard_conforming_strings | on
DateStyle | ISO, MDY
scram_iterations | 4096
default_transaction_read_only | off
application_name | psql
is_superuser | on
search_path | "$user", public
IntervalStyle | postgres
TimeZone | Asia/Karachi
integer_datetimes | on
in_hot_standby | off
(33 rows)

postgres=# set role test_role;
SET
postgres=> \conninfo+
Connection Information
Parameter | Value
-------------------------------+------------------------
Database | postgres
Client User | hunaid
Host | localhost
Host Address | 127.0.0.1
Port | 5430
Options |
Protocol Version | 3
Password Used | false
GSSAPI Authenticated | false
Backend PID | 52044
SSL Connection | true
SSL Library | OpenSSL
SSL Protocol | TLSv1.3
SSL Key Bits | 256
SSL Cipher | TLS_AES_256_GCM_SHA384
SSL Compression | off
ALPN | postgresql
is_superuser | off
role | test_role
server_encoding | UTF8
server_version | 18devel
client_encoding | UTF8
session_authorization | hunaid
standard_conforming_strings | on
DateStyle | ISO, MDY
scram_iterations | 4096
default_transaction_read_only | off
application_name | psql
search_path | "$user", public
IntervalStyle | postgres
TimeZone | Asia/Karachi
integer_datetimes | on
in_hot_standby | off
(33 rows)

Looking forward to your feedback.

Regards,
Hunaid Sohail