#46617, Restore some module listings, partially applied, I've omitted places where I felt that sortign by weight would be wanted.
We can discuss those on the issue. Patch by chx.

#21084, Node module is not marked "required", but is required by other required modules, patch by Robert Douglass

- Patch #40886 by chx: fixed problem with recursive/nested node API calls manipulating the same array references.

  "This function is called in one place, so it can be rolled into the calling function. The return value isn't used so we can remove handling of it. This is executed for every non-cached page view, so the smaller code should save a smallish ammount of memory and time."

- Patch #19895 by Moshe: currently modules can inadvertently load all other modules during the bootstrap. this is easy to do by calling a node_load() or module_invoke_all(). this degrades performance for anonymous users when caching is enabled.  With this patch, the module writer will see an php error like "Call to undefined function: drupal_set_html_head()" if this is attempted. basically, unavailable functions are actually reported as unavailable.

- Patch #17770 by chx: fixed module_invoke() and module_invoke_all() not to use NULL defaults (bugfix) + removed the limitation on the number of paramaters that can be used.

- Patch #14731 by chx: made it possible to rewrite node queries.

- Patch #13405 by Moshe: make you actually do something useful with the init hook.  A recent patch to 4.5 and HEAD made this patch run too early in the request (for non-cached pages).

   + Make bootstrap functionality work with HEAD.
   + Move functions into bootstrap.inc so that statistics_exit() works for cached pages.  (Does this close any issues?)

    + added support for multi-site configurations.
    + tidied up some old cruft and added code comments.

  * There are only two throttle levels instead of 5, namely 'enabled' and 'disabled'.  This makes it a _lot_ easier to predict when the throttle will kick in.  However, if you maintain a module that is throttle-aware, it needs to be updated!

  * The throttle mechanism now uses the current number of anonymous users or the current number of authenticated users to kick in.  This is a _lot_ more intuitive than the old throttle mechanism.

  * The throttle block has been removed -- you can now use the "Who's online" block to determine the good throttle settings.

  * Most of the documentation has been removed because it was deprecated.

  * It's less code!

- Patch #11728 by Uwe Hermann: fixed some typos in the code comments, Doxygen documentation and screen output.

  Uwe: I dropped the 'iff' chunks as 'iff' stands for 'if and only if'.

- Patch #11600 by jhriggs: the module_load_all() function will currently behave unexpectedly if a module cannot be found (has been removed, renamed, etc). Once one module fails to load, all subsequent modules will not be loaded due to a short circuit condition when performing a boolean AND.

- Patch #10663 by JonBob: documentation improvements: fixed some typos and improved consistency to the use of Doxygen/api.module commands in the comments.

- Patch #9650 by Adrian: this change introduces a module_load function, which maintains a list of modules that have already been loaded in a static array, and will not load another module of the same name, or if the file does not exist.

Modules can be stored anywhere, as there is now a set of functions called module_get_filename, and module_set_filename .. which allow system_listing and module_list to specify the locations of the files.

A new function module_load_all() replaces the hardcoded includes in module_init, and loads all modules which have been enabled, using module_load.

module_listing no longer includes files itself, instead it just keeps the listing (and sets the filenames).

This patch is a requirement for the multisite configuration patch, as overriding modules are currently being loaded due to the only protection of loading them is include_once.

- Fixed bug 5440: sort() -> asort().  Suggested by Goba.

  bootstrap code.  Patch by Kjartan.

- Removed instances of the 'throttle_enable' variable.

Committed filter separation patch: all filter-related things are now in filter.module (which is a required module).
To do this cleanly, I reorganised some bits of system.module: there is now a generic handler available for simple variable-get/set based configuration pages. Look at filter_admin() or system_view() for example usage.

(based on the patch by Goba)

- Patch 0185 by Jeremy: made it possible to automatically disable modules when
  under heave load.

- Improved module loading when serving cached pages.  Moshe's bootstrap patch.

- Used legend and fieldset tags for the configuration page.

- Committed a slightly modified version of Slavica's table prefix patch.

- Fixed some PHP "notices".

- Eliminated system_init(), the session stuff, and made it possible to
  rebuild the menu.

- Clean URL patch.

- Small improvement.  Patch by Moshe.

- Patch by Jeremy to fix a module loading bug:

    - module.inc:
       + added call to _init for all modules

    - statistics.module:
       + added statistics_init()
       + moved all global actions into statistics_init()