* api-debug.texi (Low Level Trap Calls): Removed (material

* api-debug.texi (Low Level Trap Calls): Removed (material
duplicated elsewhere); doc for with-traps and debug-object? moved
to section on evaluator trap options.
(High Level Traps): Renamed just `Traps'.  Add references to
evaluator trap options and debug options.  Make language
appropriate for core Guile (as opposed to previously separate
package).
(Location Traps): Corrected to reflect that location traps now
specify a specific position, not a range of positions.
(Debugging Examples): New (content moved here from
scheme-debugging.texi, and updated to use traps instead of
breakpoints).

* api-modules.texi (Included Guile Modules): Change `Debugging
Features' reference to `Tracing'.

* api-options.texi (Evaluator trap options): Doc for with-traps
and debug-object? is now here.

* guile.texi, scheme-debugging.texi: Move the `Tracing' content of
scheme-debugging.texi to the Modules section.

* scheme-using.texi (Using Guile in Emacs, GDS Getting Started):
Minor edits.

* scheme-debugging.texi (Debugging Features, Intro to
Breakpoints): Removed.
(Examples): Moved to api-debug.texi.
(Tracing, Old Tracing): Promoted one level.
(New Tracing, Tracing Compared): Removed.