Implement a failing symbol-plist as primitive
Fix SYMBOL-PLIST and (SETF SYMBOL-PLIST)
Move SETF to src/setf.lisp
DEBUG: Basic compiler undefined function warning
SETQ signals error if the first argument is not a symbol
throw/catch uses CatchNLX object instead of plain object
block/return-from uses BlockNLX instead of plain object
TAGBODY uses TagNLX object instead of plain object
Stop propagating errors at toplevel
Add *version* variable
Implement SQRT function