Editorial updates.
(GDS Architecture): Moved earlier in containing section; editorial
updates.
(GDS Getting Started, How to Use GDS): Merged; editorial updates;
subsections reordered.
(Continue Execution): Improved doc for continue.
(Using Guile in Emacs): Lots of new docs about the Emacs
interface.
* api-debug.texi (Low Level Trap Calls): New.
(Using Traps): Removed, material incorporated into Low Level Trap
Calls.
(High Level Traps): New.
(Breakpoints): New.
* scheme-using.texi (Single Stepping): Improve doc for step and
next.
* api-debug.texi (Debug on Error): Note need to handling of errors
in C.
"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".
Moved/merged to scheme-using.texi, as REPL features.
(Examples): New.
(Intro to Breakpoints): New introductory text here. Removed all
subnodes except for Breakpoints Overview.
* scheme-using.texi: New.
* guile.texi (Programming in Scheme): Include new
scheme-using.texi file.
* Makefile.am (guile_TEXINFOS): Include new scheme-using.texi
file.
(Throw): Moved to after the Lazy Catch node.
(Catch): Enhance to cover the optional pre-unwind handler, and new
APIs scm_c_catch, scm_catch_with_pre_unwind_handler.
(Lazy Catch): Describe relationship to with-throw-handler.
Document that the handler may return, and what happens if it does.
(Throw): Mention that a throw can be handled by a throw handler as
well as by a catch.
* boot-9.scm (load-module): Support an optional custom reader arg,
implemented by passing on to r4rs's load.
* r4rs.scm (load): Support an optional custom reader arg,
implemented by passing on to primitive-load.
* load.c (the_reader, the_reader_fluid_num): New.
(scm_primitive_load): Support custom reader.
(scm_init_load): Init the_reader and the_reader_fluid_num; export
the_reader as `current-reader'.
limited use of source properties.
* api-debug.texi (Source Properties): Documentation of source
property procedures moved here from ...
* api-procedures.texi (Procedure Properties): ... where it didn't
belong.
