0.9.0.6:

0.9.0.6:
	MORE CASE CONSISTENCY

	Make the system (with the x86-64 backend) buildable under
	(readtable-case *readtable*) => :invert.

	This may seem like a bit of an eccentric thing to do.  The plan,
	however, is to in future define this as the build mode for SBCL,
	enforcing it in the build scripts, so that userinits are
	prevented from interfering in this respect, and also so that
	case-consistency throughout the system is enforced (to reduce
	potential reader confusion further down the line).  However,
	since there are 100000 MIPS-related patches waiting to be
	merged, it would be a bad time to enforce this (and break
	all non-x86-64 backends).