Document the user-level features of the Xref package
* doc/emacs/maintaining.texi (Maintaining): Add a list of described features. (Xref): New section, made out of thoroughly rewritten "Tags" section. (Find Identifiers, Looking Up Identifiers, Xref Commands) (Identifier Search, List Identifiers): New subsections, incorporating the old tags commands and the new xref commands. (Tags Tables, Tag Syntax, Create Tags Table, Etags Regexps): Section and subsections demoted to a lower level. * doc/emacs/search.texi (Search): * doc/emacs/windows.texi (Pop Up Window): * doc/emacs/frames.texi (Creating Frames): * doc/emacs/programs.texi (Imenu, Symbol Completion): * doc/emacs/building.texi (Grep Searching): * doc/emacs/dired.texi (Operating on Files): * doc/emacs/glossary.texi (Glossary): All references to tags changed.
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