* develop: (170 commits)
[ticket/10145] Always recompile all templates when DEBUG_EXTRA is defined.
[feature/attachment-management-no-reassignment] Handle privacy and some more.
[ticket/10148] Turn TEMPLATE_BITFIELD into an instance variable.
[ticket/10147] Corrected a typo in includes/functions_template.php.
[ticket/10141] Save a hash lookup when value is not in cache.
[ticket/10143] Added tests for storing a previously deleted value in db cache.
[ticket/10105] Update AIM express link.
[ticket/10105] Update AIM application download link.
[ticket/10137] Remove unintended space at end of PHP_URL_FOPEN_SUPPORT_EXPLAIN.
[ticket/10141] Split double-assignment into conditional and unconditional part.
[ticket/10141] Use a cache in $auth->_fill_acl() for better performance.
[ticket/9961] Create log entries when users are activated.
[ticket/10139] Make signatures of set_atomic() consistent by using $new_value.
[ticket/10139] Rename $cache to $use_cache to avoid confusion with cache object
[ticket/10006] Remove unneeded if statements
[ticket/10006] Remove return values
[ticket/10006] More testing
[ticket/10006] Tweak the tests a bit
[ticket/10006] Add phpbb_config::delete
[ticket/7941] Added @return to generate_board_url docstring.
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