See 
PublishedAPI for packages intended to be used by Plugin and Contrib authors, or 
browse all packages.
See also 
Developing plugins, 
Developer's Bible, 
Technical Overview
Wizard to generate 
LocalSite.cfg file from current $Foswiki::cfg,
taking a backup as necessary.
  WIZARD save 
Params: 
-  set - hash mapping keys to values
Returns a wizard report.