#1022418. Improve a.d.o-compatible documentation for hook_node_access_explain() and document hook_node_access_acknowledge().

Fix failure to detect some 'alien' {node_access} records (records that should not be in the table and would be removed by rebuilding permissions).

Turn the node nid/title into a link fragment pointing to the node (especially useful on pages with multiple nodes).

Enhance dna_summary text.
Fix some minor bugs.

#296268 by pahariwalla. Function reference links to 404's for contributed modules and wrong branch for core functions. D5 backport.

Fix bad classification of the default grant; tune informatory text; add explanation about rebuilding permissions.

- Change all checks for APC to use the same function, for consistency

- Remove the 'title' field.
- Add the nagios hooks and all its baggage.