Pointer representation in the server

[Adam Jackson]

Is there any objection to requiring that printf support the %p modifier?  
There are quite a few places in the server where we use 0x%08lx to print 
pointer values, which is both harder to read than %p and wrong for LP64 
systems.  We do use %p in several places as well, so this is really more of a 
cleanup than a policy decision.

From a quick look, %p is supported on linux, solaris, and freebsd (and 
probably all the other BSDs as well including OS X), mingw would be the only 
unknown.

Also, what's the recommended type for host addresses?  The 'pointer' type is 
an alias for void*, which would expand to the right size on all systems; 
presumably if you want to do anything with the data at that address you'll 
cast it to something else first.

- ajax
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