Heine

#530950 by catch, andypost: use \!isset() instead of is_null() in user_access() to be consistent and more performant

#332890 by Alan D., sharda_ram, andypost: slightly better documentation for base_url in settings.php

#336627 by EliseVanLooij, Tresler, jhodgdon: node_type_form_validate() was documented to implement hook_form_validate() but is just a function called back due to how it is named after the form ID, no such hook exists

#537276 by tic2000, alex.k: feed titles in blog_feed_user() and blog_feed_last() were concatenated English strings, lacked translatability

#371458 by Gerhard Killesreiter, David Strauss, Damien Tournoud, smk-ka, catch, febbraro: add index on tab_root, weight and title in menu_router to improve performance of retrieving tabs

#318453 by svdoord and ahmed.othman, slightly modified: ensure that the user registration guidelines show above form fields added by the profile module by setting a low enough weight