* various error reporting improvements.
* optimizations: LOGNOR on fixnums is improved in the MIPS backend.
(Thanks to Thiemo Seufer)
+ * bug fix: nested reader invokations work correctly
* threads
** added x86-64 support
** incompatible change: the threading api now works with thread
** bug fix: threads are protected from signals and interruption when
starting up or going down
** bug fix: a race where an exiting thread could lose its stack to gc
+ ** bug fix: don't halt on infinite error in threads if possible
** fixed numerous gc deadlocks introduced in the pthread merge
+ ** bug fix: fixed thread safety issues in read and print
+ ** bug fix: debugger doesn't hang on session lock if interrupted at
+ an inappropriate moment
* fixed some bugs revealed by Paul Dietz' test suite:
** TYPE-ERRORs from signalled by COERCE now have DATUM and
EXPECTED-TYPE slots filled.