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.
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.
