[ODE] stack requirements

[David McClurg]

ode/src/stack.cpp/h seems to be a *unused* replacement for alloca.  is this something that never got finished or didn't work out?  Here's the interface...

class dStack
{
  void init(int max_size);
  void pushFrame();
  void popFrame();
  char *alloc(int size)
};

Can I help with this?  Do you prefer a ansi-C interface with function overrides like the other memory routines to make it public?

I need to have something like this to lower my stack requirements.  Also-- "The alloca() function is machine dependent; its use is discouraged."