Hello,

This patch replaces the commands:

	set/show backtrace-below-main
	show backtrace-below-main

with the pair of commands:

	set/show backtrace past-main
	set/show backtrace limit

where the latter sets an absolute bound on the number of backtraces. 
10000 (arbitrary) by default.

While the command could technically be named "above-main", "past-main" 
should avoid any "top", "bottom", "up" and "down".

I'm looking to commit at least the "past-main" command to 6.0 branch 
towards the end of the week (>2003-08-06)

eli, the doco ok?

Andrew