[slime-devel] Package split

I just merged my package-split branch into the main trunk. We have now a new package SWANK-BACKEND. It is basically stand-alone and doesn't need the rest of SWANK. Of course, SWANK calls functions in the backend. I moved some functionality like handling of restarts and a lot symbol-to-string conversion to swank.lisp. The load order is now:

swank-loader, swank-backend, swank-[cmucl,sbcl...], swank

This means, we could define macros in the backend and use them in SWANK.

I tested a bit with my usual implementations. I added the necessary changes for OpenMCL, but don't know if they actually work. Feedback welcome.

Helmut.