crange and range "defined as a class here but previously declared as a
struct"

"non-inline namespace cannot be reopened as inline"

Conflicts:
	vm.cc

Conflicts:
	crange.cc
	kernel.h

Much room for cleanup

Hopefully this is enough to prevent all the random connections to
josmp.

..to use clang, define USE_CLANG in config.mk.

use a virtual do_gc() function instead of virtual destructor; gives more freedom in choice of memory allocation

add debug information (string type) for rcu data structures

clang complains that these are unnecessary for Linux and from reading
the gcc manual it looks like that might now be unnecessary for OS X.