Removing debug output.
Using temp variables in safe accessor macros to avoid combinatorial code
explosion.  Makes this gccs-specific, but it's only used for debugging anyway.
Fixing typo.
Optionally conservatively marking bytecode data.
Merge.
File descriptors maintain a reference count of ports open on them
They can be close()d explicitly with close-file-descriptor, and
will close() on gc, but only explicitly closing the last port on
them will close the fileno.  Notably needed for network sockets
where we open separate input and output ports on the same socket.
Merge.
Removing conservative bytecode gc.
Adding a sample repl server.
Fix bug in port-base quoted-printable-encode reported by Seth.
R7RS test patches for Windows from Per Bothner.
Fixing right shift of a fixnum by > word size.
Fixes bug report from Miroslav Urbanek.