addt'l minor debugger documentation issues

Hello,

I have collected some additional issues about the 
debugger documentation. I'm hoping to revise the
texinfo files which have to do with the debugger and
then convince someone to commit the changes. Does
that seem like a plan?

I have specific changes in mind for each of these items,
so if anyone would like to discuss more details, that's great.

 - merror.lisp: strike extraneous right parenthesis 
   in error message ("try DEBUGMODE(TRUE);)"), 
   and change "DEBUGMODE(TRUE)" to "DEBUGMODE:TRUE" since
   DEBUGMODE is documented as a variable ?

 - grep -i '$lispdebugmode' *.lisp; grep -i '$debugprintmode' *.lisp
    -- yield only one commented-out line each
   grep -i '$debug\W' *.lisp -- yields a commented-out line, and also
   "(SUBC $DEBUGGING () $TRACE $DEBUG $DEBUGMODE $BREAK
   $BINDTEST $OPTIONSET)" in option.lisp

   - from this it appears that LISPDEBUGMODE, DEBUGPRINTMODE,
     and DEBUG are obsolete

   - Command.texi: strike entries for DEBUG and DEBUGPRINTMODE ?

   - Program.texi: strike entry for LISPDEBUGMODE ?

 - in debugger: "help" and "?" don't show help, only ":help"
   -- so:
   
   - merror.lisp: "Entering the Maxima Debugger dbm"
     -> "Entering the Maxima Debugger. Type :h for debugger
     commands, :q to quit the debugger, or DESCRIBE(DEBUGGING);
     for more information." ?
   
 - mdebug.lisp: ":foo" yields "FOO is not break command"
   -- "FOO is not break command" -> "FOO is not a debugger
   command. Type :h for help." ?

 - Debugging.texi: rename section "Keyword Commands" to
   "Debugger Commands" ?

 - Command.texi: rework entry for DEBUGMODE

 - mdebug.lisp: beautify the output under "Break commands start with"
   -- align descriptions to make them easier to comprehend

 - Debugging.texi: commands under "Definitions for Debugging"
   appear to work as advertised, but there are many small
   changes that can make the descriptions clearer


If you have any comments, that will be very helpful.

Robert Dodier
    


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