debugging:

Implement an upper limit for allocated memory, specify as:
	-smalloc,40M

Give the malloc allocator its own stats counters so we can see deeply
into what it does.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2629 d4fa192b-c00b-0410-8231-f00ffab90ce4