Stack filling.

[Joel Sherrill <joel@OARcorp.com>]

Till Straumann wrote:
> Will the stack filling be optional? There might be concerns about 
> performance
> suffering, especially on slower CPUs.

This is my concern also.  I do not want it in the code base for
thread creation by default either.  It would be OK to have a
shared support routine in score to fill a thread stack but it
should be turned on/referenced by either a capture engine
extension or the stack check extension.

--joel