Version 1.0.3
* Fixes
- fix buggy implementation of member and assoc when the
predicate is not a standard procedure (not eq?, eqv? or equal?)
- fix substraction of reals
- reintroduce ability to set or refer to undefined global objects
- fix print of operators
* Added
- procedure tr7-exec-stack when USE_TR7_DEBUG for getting a copy
of the current execution stack