#194494 by Jax, slightly expanded: unify empty password handling is MySQL and MySQLi installer and runtime drivers

 - whitespaces at end of lines
 - indentation
 - control structure usage
 - whitespace in empty lines
 - phpdoc comment formatting

#193580 by chx: given recent improvements, Drupal does not require CREATE TEMPORARY TABLE and LOCK TABLES permissions, so do not check on install and do not advise people giving these rights

- Patch #79428 by Chris Johnson: remove int display width declarations from MySQL create table statements.

- Patch #68926 by chx, jeremy, steven, eaton, webchick, amazon, neil, nedjo et al: an initial install system for Drupal core.