Function: Determine if global tables should be upgraded.

Function: Install global terms.

Function: Runs before the schema is upgraded.

Function: Disables the Link Manager on upgrade if, at the time of upgrade, no links exist in the DB.

Function: Disables the Automattic widgets plugin, which was merged into core.

Function: Checks the version of the installed MySQL binary.

Function: Translate user level to user role name.

Function: Creates a site theme.

Function: Creates a site theme from the default theme.