#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.

#48209, Prevent system module forms (system/theme settings) from saving 'reset' to the variables table., patch by Markus Petrux

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

#48025, System table not updated when moving modules, patch by grugnog, changed variable name to match conventions.

- Patch #42068 by mfb et al: fixed problem with aggregator destroying certain links.  Moved filtering to on output.  (Today's critical bugfix #2.)

- Patch #31354 by Junyor et al: move node revision information for files to a separate table. (Today's critical bugfix #1.)