* libguile/struct.c (scm_struct_ref, scm_struct_set_x): "Light" structs
have no hidden words (members of the SCM_STRUCT_DATA(x) array accessed
with negative indices). In that case, determine the number of fields
from the length of the struct layout descriptor. (Most GOOPS instances
are light structs.)
* libguile/goops.c (get_slot_value, set_slot_value): In the struct
allocation case, don't poke the slots array directly -- we should
go through struct-ref/struct-set! code so that we get the
permissions and allocation ('u' versus 'p') correct.
* debugger/commands.scm (evaluate, info-args, info-frame,
position, up, down): Improve/fix doc strings.
* Makefile.am (SUBDIRS): Add debugging.
(ice9_sources): Add gds-client.scm and gds-server.scm.
* scheme-debugging.texi: Remove lots of text that is now
duplicated (exactly) elsewhere, leaving only the `Tracing' node.
* guile.texi: Replace `Debugging Features' (scheme-debugging.texi)
by `Using Guile Interactively' and `Using Guile in Emacs'
(scheme-using.texi). Move the `Tracing' content of
scheme-debugging.texi to the Modules section.
* api-options.texi (Evaluator trap options): Move doc for
with-traps and debug-object? to here.
* api-modules.texi (Included Guile Modules): Change reference from
`Debugging Features' to `Tracing'.
* api-evaluation.texi (Evaluator Behaviour): Add reference to
`Evaluator trap options'.
* api-debug.texi (Examining the Stack): Minor improvements to
display-backtrace doc.
* api-debug.texi (Debug on Error): New text on how to catch errors
and the error stack.
* api-debug.texi (High Level Traps): New.
* api-debug.texi (Debugging): New intro text. New subsection
"Evaluation Model". Moved existing subsections "Capturing the
Stack or Innermost Stack Frame", "Examining the Stack", "Examining
Stack Frames", "Source Properties", "Decoding Memoized Source
Expressions" and "Starting a New Stack" under "Evaluation Model".
(Capturing the Stack or Innermost Stack Frame): Some new text, and
correction to doc for last-stack-frame.
(Debug on Error): Renamed from "Interactive Debugging".
* configure.in (AC_CONFIG_FILES): Add emacs/Makefile and
ice-9/debugging/Makefile.
* Makefile.am (SUBDIRS): Add emacs.
* scheme-using.texi: New (merged with modifications from CVS
HEAD).
* Makefile.am, gds-scheme.el, gds-server.el, gds.el: New (merged
with modifications from CVS HEAD).
* debugging/Makefile.am, debugging/example-fns.scm,
debugging/ice-9-debugger-extensions.scm, debugging/steps.scm,
debugging/trace.scm, debugging/traps.scm, debugging/trc.scm: New
(merged with modifications from CVS HEAD).
* gds-client.scm, gds-server.scm: New (merged with modifications
from CVS HEAD).
