[ticket/16686] Simplify get_database_size() SQL query for PostgreSQL
Reduce number of queries to get database size and add it to the cache
for 2 hours, like it is being done for other RDBMS.

PHPBB3-16686

[ticket/16686] Simplify get_database_size() SQL query for PostgreSQL
Reduce number of queries to get database size and add it to the cache
for 2 hours, like it is being done for other RDBMS.

PHPBB3-16686

[ticket/16525] Remove usage of pg_constraint.consrc for PostgreSQL 12
The column pg_constraint.consrc has been deprecated for a long time,
and it was finally removed in PostgreSQL 12.0

PHPBB3-16525

[ticket/16525] Remove usage of pg_constraint.consrc for PostgreSQL 12
The column pg_constraint.consrc has been deprecated for a long time,
and it was finally removed in PostgreSQL 12.0

PHPBB3-16525

[ticket/16440] Run tests on a stable PHP 7.4 version
PHPBB3-16440

[ticket/16338] Add DuckDuckGo bot
PHPBB3-16338

[ticket/15572] Fix W3C validation error for quote BBCode
PHPBB3-15572

[ticket/16440] Run tests on a stable PHP 7.4 version
PHPBB3-16440

[ticket/16315] Remove Google+ profile field
PHPBB3-16315

[ticket/16313] Remove http block from sample Nginx configuration file
Change placeholder domain to example.com

Also prefer fastcgi.conf over fastcgi_params as per Nginx documentation.

PHPBB3-16313

[ticket/16313] Remove http block from sample Nginx configuration file
Change placeholder domain to example.com

Also prefer fastcgi.conf over fastcgi_params as per Nginx documentation.

PHPBB3-16313

[ticket/16323] Replace the spaceless tag with its homologue filter
PHPBB3-16323